I stayed at Simon's place 3 nights during a conference at the congress center. Simon replied to all our questions promptly before and during our stay.

My colleague and I had some difficulties finding the place from the metro, but once you know the way, it's very easy. Simon arranged for us to pick up the keys at a shop nearby. The apartment is clean and spacious, perfect for me and my collegue. Beds are comfy and plenty of hot water in the shower. Nice place to stay if you plan to do a lot of sightseeing in Prague, the tram stops outside the building. There are limited cooking possibilities, but ok for quick bit and coffee before running out in the morning. I would recommend this place.