Maybe Lila Chiang Mai Massages Room isn't the cheapest place to go, but the facilities are the best I've seen. It's very clean, with fresh linen and towels for each client. One of the more interesting things about this place is that behind this incredible massage parlor, there's also a social project that helps women develop relationships with ex-convicts, giving them quality training and a chance at a new life. They'll treat you to free internet if you have to wait a little while. They do recommend booking a reservation in advance (a few hours before should be enough). The whole body one hour massage costs about 200 Bhats.