The host was very good at communicating and spoke to us before and during our stay and would reply quickly if we needed something.
The apartment is in a great location, only 10 minute walk to old town square with a mini market right next door, it is also extremely clean.
However, you should bear in mind, that others staying in the apartment block smoke outside the apartment, in a shared hall way, so it smells of smoke when you walk in, so perhaps not ideal for non smokers, also they use this hallway till early hours of the morning, so those staying in the room closet to the shared hallway may be kept awake if light sleepers. Also, 2 of the bedrooms don't have doors and one bedroom is accessed through another, so realistically you all need to be going to sleep at the same time, else you risk waking others up.
Finally we were given 1 set of keys, which was very inconvenient, 9 people do not always want to do the same thing. We asked for a second pair of keys a couple of times and eventually alex and ilona said we could collect them from the office, but when we did they didn't have all the keys we needed to access the apartment, finally they delivered another full set of keys. So i would recommend that you tell them you want 2 sets from the beginning.
Overall, the apartment was clean in a great location, but I don't know whether it would be a bit tight for 2 families. I think it would be better for 1 family or group of friends that are going to be doing similar things.