We had a great few days in Jon's flat. There were 4 of us (2 couples) and the flat was really spacious, clean, and with everything we needed. Location was close to the centre (10minute cycle - we found that once we hired bikes we used them to get around everywhere) and - barring the number of steps to climb to the top floor - we couldn't fault it.
Jon was extremely helpful before we arrived and remained contactable throughout our stay. His recommendations for where to eat where really useful and we made use of 3 of them during our short stay.
In all I'd recommend Jon's flat to anyone both for the flat itself and the ready assistance he was prepared to give.