Overall we had a great time in Prague. The apartment was big enough to accommodate all 9 of us. It's good to know that besides the 6 beds and the extandible sofa there is an extra mattress in the storage room. There is a renting company handling the apartment. They were very informative and helpful. They are sending the keys by mail prior the arrival, which was nice since my sister needed early check-in. The only problem was that the heating didn't work when she arrived. But someone came and fixed it the same day.
The livingroom is realy cosy, with a small balcony where u can go out and smoke. Aside that, the location of the apartment is right in the center of Prague with lots of bars, shops and atractions at a 10min walking distance.