Great location right in the heart of the Old Town and just a few minutes walk from most of the historic sights and a range of restaurants and pubs. The apartment is large and airy and is very clean and tidy.
The streets around the apartment are busy but this was not noticeable inside, we slept very well each night and weren't disturbed at any time.
Check in was very easy, keys located as described and all codes worked first time.
The lift to the apartment is quite small and begins one flight up so very large cases could be difficult (It is an old building so modernisation wouldn't possible). We did however manage well with 1x 24kg case and 2x under seat bags.
If were staying in Prague again I would happily stay here again and would be as happy to recommend it to anyone. The location for this price is hard to beat.