I had a very pleasant experience at Cool Guesthouse.
The place is beautiful and charming. The staff is very friendly and easy to communicate with, which I found very helpful as it was my first time in Chiang Mai and needed all sorts of information and help here and there.
My room was cosy, very clean and quiet at night which I really enjoyed. The Cafe downstairs also is quite convenient to have breakfast (good value).
Overall I think it's exactly what one would expect for this price, plus a charming atmosphere :)More