Jan's place is a lovely, character-filled old apartment. The neighbourhood is busy/noisy with traffic, trams and bars, however is located in very close proximity to Vaclav Square and has tram and metro very close by, making it very easy to get around Prague.
Communication from Jan was excellent. The kids were kept entertained by the toys in the kids room, the beds were very comfortable and it was good value for central Prague.
Small issues included the parquet flooring which looks lovely, but is very noisy when you walk on it and can wake light sleepers. Also the bathroom soap ran out soon after arrival. None of these things were major problems for us.
Overall, we loved the apartment and highly recommend it.