This should actually be "seventh floor", because in Ukraine (and Russia as well) they count ground floor as a first floor.
Since this building has at least 8 levels, it most likely has an elevator, and then you should use whatever numbers on the elevator buttons are.
Of course, it helps if they are labelled correctly:
Absolutely not. If I told you to go to the apartment on the eighth floor, why would you press seven? This has no relation to how a building's floors are numbered. I agree that what would be confusing would be on the way down and how the ground floor is labeled. If that is what you meant.
Good point I had no idea about it. This means that the translation would be correct in America but not in Europe.
You're absolutely right, however I believe it would be very confusing to the learners.
It's either the seventh or the eighth, no matter what country you're in. Unless you omit a floor, like in America, there's no "thirteenth" floor. It's always numbered 14 due to superstition.