The communication was perfect. Every question was answered very quickly, though it is funny that every time it was a different person, in total, I think I exchanged messages with 5-6 people. I don't want to repeat what other reviewers mentioned many times: great apartment, fantastic location and stairs.
One thing to be aware of: taxis don't go to this address. This street is too narrow. Theoretically, they should go to a perpendicular street, which is wide enough for them. However, both times, on arrival and departure, drivers refused to do it. It's not a big deal if you aware of that in advance. Like on arrival, we just got out, walked, maybe 3 minutes with our luggage and that's it. But on the way back we had to be in airport at 5am and when we found out that the driver can not make it to our street, we got nervous, because it meant some extra minutes to our trip to the airport. Fortunately, we planned for some extra time, so everything went well. Just plan accordingly.