We really had a brilliant weekend at John's appartment. The appartment is just like the description says "close but quiet". The northern quarter is just a 5 minute away....the city centre/shopping areas also 5-10 minutes. We even walked to the Etihad Stadium. Just for the Salford Quays we used the Metrolink (a station is also 5 minutes away). No noise and absolutely quiet at night, although it was a busy weekend with Manchester Day and Stone Roses Concerts.
The room and the appartement was clean...everything there you need.
Very Highly Recommended anyone going to Manchester!