Very clean and modern, in a beautifully refurbished building, quite close to a tram station and some convenient stores, bars, restaurants, money exchange office, etc. The public transportation work very well in Prague, it's even possible to travel from airport to the apartment very efficiently and convenient (only 32 CZK=1.3 Euro). However, as we like to walk, it was a pleasure to go on foot to the old town or to the main railway station, many other attractions being also reachable this way.
A great plus - there are two modern bathrooms which makes the stay of 3 persons more pleasant. Also, there is a small but well equipped kitchen (including an espresso machine for which Jan provided also a nice supply of coffee), a nice TV (we found only Czech programs but it wasn't so important for us), a washing machine.
The bed and the coach were very comfortable and the apartment, despite the very high number of bars around, was surprisingly quiet, all of these allowing for good quality sleep.
The communication with Jana went smooth, the check in/check out went great through safe boxes. Jana was very nice and allowed us to check in earlier so we had the opportunity to start enjoying the beautiful Prague right after getting there.
We had an issue when discovered, after leaving the apartment at 6 o'clock AM and closing its door for good with the keys inside, that the building door was key locked (thing what never happened in the 5 mornings before). As we were heading to the airport, with not much time to waste, the perspective of being trapped there until some of the neighbors hopefully open the door was really scary. However, after I called Jana, she quickly found a solution, despite the early hour of a Saturday morning, and we managed to catch our flight.
One small issue, mainly for people with mobility problems, could be the walk needed from the tram station to the apartment - it's about 300 meters and a gentle slope.