Let me start by saying that the apartment is fantastic in every way. Bright and spacious. Excellent location, comfy furniture and great amenities.
Both our host are responsive, meaning they respond via airbnb very quickly.
The only issue resulted in a not entirely pleasant stay is probably our own fault. The key to the apartment consists of a magnetic swipe for building gate and a key to the apartment. The building gate also can be open with a code but not between 10 pm to 4 am. Somehow we didn't quite understand the time restrain for the code to work. Since there are two of us staying and also the key is needed to lock the apartment (both from inside and outside), we separated the swipe and the key so it's easier if one of us steps out briefly. Foolishly, we didn't bring the swipe with us when we went out for dinner sat night, and when we returned around midnight, we couldn't open the front gate with the code.
There isn't a building manager, and since it's a semi-residential building, no one is coming in and out at that time. We contacted the hosts and asked if there was anything we could do, anyone we could contact. The hosts responded promptly but said there was no other way but to wait to see if someone comes in or out. He also said that he hopes we don't have to wait until 4am. It didn't feel too nice that he didn't offer any help or to explain why he couldn't although the incidence is due to our own stupidity. We waited for half an hour and gave up, went to stay in a hotel.
If you are not entirely sure that you won't need the host's help in turns of a lock out emergency, I wouldn't recommend the place since no backup mechanism is in place.