If you are looking for clean no frills accomodation in Chaing Mai 'Nice Appartments' will be a good choice. Ms Chon is an easy going landlady who will provide clean rooms at a very affordable price, throwing in free tea and Thai bananas for a good meassure.
She will also allow you to leave your bags when you go off on a trek, even if it is a three day trek, and will put away your valuable possesions on a security lock. She will make you sign several forms for that and seal your possesions, but I felt better for that.
There is a 1AM curfew, so if you are here partying this may not be your place
www.adegreeaday.blogspot.com
Off the main road just by the main gat
15 Soi 1 Ratchadamnem Road
Is this your business?