It was great stay, hosts were awesome and responsive, flat is big and clean and location is near main square.
1. Hosts. They were very responsive and helpful, they allowed us to leave our luggage before check-in time and provided baby crib for our 11-mo old son. Also they arranged airport transfer for us for 550 CZK/22 Euro.
2. Apartment. It is quite big (3 big rooms with 3 large beds, big kitchen and big hallway). It was very clean and matched photos 100%.
3. Location. It is perfect, 5 minute walk to main square, to grocery store (Zabka) and to pharmacy.
Note (as some of the reviews say): apartment is officially on 3rd floor, but it's more like 5th floor with elevator starting and 2nd floor - you'll need to climb up from ground floor to 2nd. And elevator is tiny - stroller or 2 big check-in bags won't fit in. Just be aware that some of the stuff you'll need to carry on the stairs (one of the hosts Stephan helped us to carry our bags).