The place is well equipped nice studio flat. It's located a bit outside of the touristic heart (around 20-25 to Charles bridge by foot). But you have a nice neighborhood - there's a Tesco shop and decent restaurants and cafes nearby - plus it's quiet and you can take a beautiful walk along Vltava. We wanted exactly this kind of location, so for us it's a plus.
All things in the flat were in a very good condition, the bed is large and comfortable though squeaky. There were everything for a short stay, but make sure to bring your own shampoo and shower gel as this is not provided!
Extra thanks to Mark for organizing a convenient way to leave the luggage and pick up the keys. Another thanks goes to a very nice and friendly lady in the hotel where we could leave our luggage :-)