We had a great week-end in Vadim and Ilia's apartment ! They were both waiting for us when we arrived (at 9pm).
The flat is right in the middle of Prague's old town, so you are close to everything, we didn't had to buy any transport tickets during the entire week-end (except for the airport).
You access the flat through a locked private yard, so you are not exposed to the street noise and the place is safe.

Even if we rented only a room, we had the whole apartment just for us, as Vadim and Ilia are using the other room for their work.

The room was quite big, everything was clean, our hosts offered us to help ourselves in the fridge if we wanted to.

We really recommend this place if you are a couple and want to discover the beauty of Prague !