I think the page is this one osm.wiki/One_feature,_one_OSM_element
"An area object with a node object inside, both with the same tags representing the same real-world feature."
An address is a property of the building (or more correctly for Bulgaria: the land the building stands on), so it should be added to the building (the "real-world feature" it belongs to) and only to the building.

I'm not an IT specialist, but I understand that it's easy for software to derive the address of a business from the address of the building the node for it is in. That some software doesn't do this well is a fault of that software, not of OSM.
In Bulgaria the consensus is to add addresses to the building area. In other countries, the OSM community reached a consensus to add it to separate nodes that only have the address. The information for a business then contains only the info for that business but not the address, to prevent that if the business disappears and is deleted, the address is also deleted.
There is also a consensus that the address is added either to the building or to a node, not to both. See osm.wiki/Mapping_addresses_as_separate_nodes_or_by_adding_to_building_polygons

Thanks for adding this and other businesses to the map! However we have a habit of adding addresses only to buildings, and not again on nodes within those buildings. So if you add a business in a building which already has an address, it's not necessary to add the address again.

added fences and retaining wall now. There's even a Частна собственост sign, I saw today.

Hi, thanks for your edits! Are you sure that for this node node/3672217864 that is the name of the cafe, and not the name of the brand of coffee they are selling?

I should have mapped the fence... and I think there's also access to the parking garage under the building after the lift gate

It is fenced now

Thanks for your revert of the construction status of that motorway: it is under repair, but probably not worth mapping that as it's temporary.
I did revert your edits west of the junction with the ring road, however. There's been a discussion about the motorway status of the section east of the ring road https://community.openstreetmap.org/t/motorway-status-of/122136 but west of it, it's definitely not a motorway

See note/4965954
Please don't map something if you're not sure what it is you're mapping...

There are "fixme=verify position" tags on some of these. Can these be removed?

Then maybe it's not a good idea to edit the map for it. Users of OSM data often update their information infrequently, so if they update it now, it may take several weeks before they update it again and in the meantime their maps will show it as a road under construction while the remont is already finished.

Good news that it started, it is badly needed! Do you know how long it is expected to take? (considering osm.wiki/Good_practice#Don't_map_temporary_events_and_temporary_features )

We should map what's on the ground. If it has actually started, we should map it as started, even if it's not official. Like if someone built a house without building permission, we should map it even though it's not officially there.

Interrupted construction is still construction, I think. The life cycle should go from proposed - construction - in use - disused - abandoned. Quite a few building projects in Bulgaria go from construction straight to abandoned, but I don't think it should go back to proposed. When construction restarts, it is unlikely to be with a different route.

Hier is inderdaad een school in aanbouw, maar het is niet Stela Nova maar het nieuwe gezamenlijke gebouw van OBS de Regenboog en CBS De Wingerd. Ik heb de tags die volgens mij niet bij dit gebouw horen weggehaald: waarschijnlijk horen ze bij een andere school in aanbouw in een andere wijk. Ook heb ik de geschatte vorm van het gebouw in aanbouw toegevoegd, en het voetbalveld ten noorden van De Regenboog weggehaald (ligt nu een meter of 3 zand op). Hoe de paden nu lopen heb ik niet kunnen verkennen, maar dat zal zo wie zo tijdelijk zijn.

It's better now than it was. Il meglio è l'inimico del bene

It is, but it's also used to park the rental cars I assume. I didn't walk all the way down to the car park, just noticed signs at the access road

added

Another example changeset/171134746
The river is called Danube in English, but probably no English-speaking person has ever heard of the street, so its name is only Дунав in Cyrillic and Dunav in Latin script.

If names are going to change soon, let's wait. But I think what users should get to see on their map is what's on the signs. That's why I removed name:en=Princess Marie Louise here changeset/171192609 because that name is nowhere to be seen at the station. I got to see that name on my laptop in iD; now that I removed it, I get to see what's in int_name and that's how it should be.