We stayed in the Ruen Come In during our honeymoon in July 2013 (not in August - but I could not select July 2013 any more when writing this review) and we would absolutely recommend it...
Very, very nice small boutique Hotel with only five rooms in a Lanna style Teak wood house.
The rooms are very clean with good air condition, a nice and clean bathroom, a small safe and of course (almost) everything is made of Teak.
The old city is only a few minutes away (brave people can walk, you can also use the bikes that the Ruen Come In offers to their guests).
The Ruen Come In also has a small restaurant (not many walk-in guests) and we had dinner there once - reasonable pricing and the food was very good.
The american style breakfast is good, coffee could be slightly better (like anywhere in Thailand... that is especially true if you usually like Espresso Doppio).
The staff is very, very friendly and helpfull.
A laundry service is a few minutes down the street (and how they folded my sneaker socks is just amazing) and if you walk a little further you will reach all kinds of small Shops, 7Eleven, drug store and the like.
We will most likely come back when visitin Chiang Mai again.More