Katerina's is very helpfull, there was some trouble with the apartment we initially booked but Katerina's was extremely helpful and arranged for us to stay at an apartment closer to the town centre which was great. It was walking distance from most of Prague's attractions. We had a few minor issues such as sockets not working and quite a few cob webs but overall the apartment had everything you could possibly need and kakta was very helpul. The building also felt very safe, there is also a terrace however it could do with some TLC.