First the many, many pluses--location, location, location! This hotel is so close to the attractions (Charles bridge--2 min. walk, Prague castle-10 min.walk, Petrin, Astronomical Clocktower) but on a quiet side street which is LOVELY. The hotel rooms are beautiful, everything feels fresh, new, excellent beds/mattresses to sleep on. Our apartment even had a washing machine. The staff is lovely and helpful. The Mondieu restaurant right next doors is excellent and it feels like part of the hotel which makes for easy food options. Close by is a grocery store too. You have to walk to the Petrin rozhledna when you come--it's a bit of a hike but the view is phenomenal!
The single issue is the AC. It works fine but makes pretty bad noise every few minutes, making it a bit unenjoyable to relax. We were told this only affects three apartments so if you are booking a single room, it would not be an issue. In sum, we would 100% stay again, just not in #26 and the other two apartments where this is an issue.