I removed the Spanish name of the airport because the official name is Васил Левски (Vasil Levski). If the official Spanish name is different than Vasil Levski, it can be added.
I removed the English and Spanish names of Obelya metro station because they are not different from the one in int_name (which should contain the name in Latin script transliterated from Cyrillic according to the Bulgarian transliteration law, so I also removed Obelia from it). I removed "Monumento" from the Spanish name of the memorial to Petko and Pencho Slaveyko because the information that it is a monument is already contained in the historic=memorial tag. If you have comments on my other edits, let me know and we'll discuss them :)

I reverted your edit because of osm.wiki/Good_practice#Don't_map_historic_events_and_historic_features (the existing remainders are already mapped)

It's been a long time, so I don't remember but I probably added the addresses based on cadastre data. Both are No. 2 according to cadastre, so to differentiate between them, probably one should be 2A

Thank you! :)

Sorry, I mean Malinova dolina

As you can see, my surveys are slowly moving south through Studentski grad, so I hope to soon reach Manastirski livadi and check completion of buildings there. If you want you could wait for that.

So which business did the pastry shop replace? In that building there are 4 shop spaces, until recently occupied by Pavillion24, a shoemaker, a watchmaker, and a fireplace shop. In the next building is Promarket supermarket. Where is the new pastry shop?

It doesn't block the recycling quest in SC...
There are a couple of those in Studentski grad too

Like so many times before, you made a complete mess out of your edits and I'm getting so sick of repairing the damage that I'm considering to ask for a ban of your account.
- You added a new shop node at almost exactly the location of an already existing shop (a watchmaker). If the new shop replaces the old one, please update the tags of the existing shop node instead of creating a new one.
- you added address tags while the node is inside a building that already has address tags. Please don't add address tags unless the address is different from that of the building, and if so, use the spelling of the nearby street in Cyrillic. There is usually no need to add anything but the street name and house number because software can determine the rest.
- Please check the format of the opening hours here opening_hours=* You failed to include a ; to separate the day ranges
- this time you got the phone number format right! It should always start with +359 for Bulgaria

Hi, please consider if Баничарница is really the name of the shop, and not a description of it. I think I would tag it with noname=yes + description=Баничарница Unfortunately we don't have a better tag than shop=bakery for something as special as a Баничарница
See osm.wiki/Names#Names_are_not_for_descriptions and https://community.openstreetmap.org/t/topic/134467/2

osm.wiki/Changeset#Geographical_size_of_changesets

The difference is small, but iD makes teh difference between "Managed Forest" (landuse=forest) and "Natural Wood" (natural=wood) Borisova Gradina is definitely not natural (all trees are planted) and managed (fallen trees on paths are removed). It's not something I want to spend much time on though...

You added a lot of individual trees around the new CSKA stadium. To me it looks like a small forest that I would have mapped with as an area with landuse=forest (a managed forest, so not natural=wood). Why didn't you?

Unfortunately there are many bad examples, so it's not unusual to doit like you did. I want to start a thread about it on the Bulgaria forum