I was planning a 7 night trip to Chania for my wife, our 15 year old son and myself. Since our son is 6'2" already, I was looking for a place that had an actual bed he could sleep in. Everything I found in Chania was catering to couples. All of the hotels I looked at would have some form of a couch for him to sleep on, which doesn't work for 7 nights.
When I found St. Catherine's place I read all the reviews, and they are accurate. The apartment is very clean, with an amazing location, Tonia is a great communicator, the air conditioning was excellent and the accommodations very comfortable.
If you are considering staying in Old Town (which I definitely recommend) realize that anywhere you stay will have two things in common: stairs and street noise. If either of those things are deal breakers for you, probably better for you to look outside of Old Town.
When we return to Chania, we will definitely stay at this apartment again!