The flat is two-level which is really cool and makes it spacious and unique. However it was on 3rd floor. For someone with fear of heights climbing up and down could be really hard (it kinda was for me, but I got support).
The view from the bottom level rooms was fantastic. In the house there was everything we needed. It was clean and styled modern.
At the night the way from the second floor bedroom to the bathroom was little tricky because of the wooden bars placed on the floor (I know it has to be there because of construction matters) but it made the little trip more adventurous.
In general I really recommend. It is close to everything, the flat is clean, the hosts are nice. Great place to stay in Prague.