Stayed for 4 nights with husband and teenage son. The location is excellent - within walking distance of all the main sights (and the tram to the rugby / football stadium) but away from the main tourist crowds and on a side street with no traffic. There are good restaurants and a small shop for supplies on adjacent streets.
The flat is small - with 3 people there isn't really anywhere comfortable to sit except in / on the bed, but it was very clean and well equipped with plenty of storage space.
Communication was excellent, Alex responded to emails promptly, was waiting for us when we arrived and answered our questions helpfully.