We stayed for three nights, and have really enjoyed Roman's flat and all the fine details you could find there.
Bed is comfy and big, flat is bright and sunny, as described.
As mentioned before in comments, ceiling above bathtub is super low, so it is more convinient to have a bath, especially if you are taller than 165 cm :)
Also, for some reason we couldn't open the windows, only the upper part is openable.
But it really did not affect our enjoyment.
Would stay there again, and recommend to anyone visiting Prague, who prefers more "personal" accomodation over generic Ikea apartments which are available everywhere.