The place was fine, but we waited almost 45 minutes to check in (luckily a neighbour let us into the entry out of the cold). We gave a half hour window for our arrival and we were told to ring the bell when we got there and if no one answered to send a message or call a particular number. I told Alla several days in advance that we would have to send a message through the app because we didn’t have voice services, only data. However after ringing the bell a few times and sending several unanswered messages, our only option was to download the Skype app and buy Skype credit so we could make a call, which went unanswered anyway. Finally our second all was answered and the cohost Marc seemed surprised that we were waiting. A couple of minutes later a woman (who must have been in the building the whole time and who I don’t think was Alla) appeared and let us in, and gave some sort of explanation about recurring issues with messages being received etc.
Also, note that there is a 5% tax you have to pay in cash on check in. I don’t recall seeing this when I booked but it seem to be stated in the house rules in German only.