We had a very pleasant stay for more than three weeks at Dim's apartment. the area is certainly the best to stay in in Rethymno, for it is less touristic than others, still shops and the public garden are very close.
The kitchen is perfectly equipped, balconys are awesome: one to sit and have dinner, one to put laundry up.
Only one more tip for staying with Dim: bring your own towels for the beach. :)