I have spent two week at Rethymnon for a summer school at Crete University.
Dena's apartment became a home to me. It is small but has everything one could possibly need, including a well equipted kitchen and a pretty little porch to relax in and have some coffee.
The location is amazing, near everything and right in the center, Dena is always available for any request and was even kind of enough to come pick me up when I got lost on my way to check in :)
I hightly recommand.