Our host was great, they have a few places in Prague and run an office near the main station. They were really helpful, were able to give us a couple of sets of keys because there were a few of us staying which was helpful! They also gave us a great welcome pack with some tips on what to see and what restaurants to go to etc which is always nice when visiting a new place. Prague itself is lovely, very safe and every corner you turn is picturesque, I'd highly recommend it!