My sister-in-law and I stayed with Anne-Marie and her family for a whole month, and I don't think there's anywhere we would have rather stayed.
Colinton is a great place, far enough away from the city center to be quiet and relaxing, but still close enough that you can get to it in about 20 minutes on the bus. We also really enjoyed the people of Colinton, and had some great conversations just by staying for coffee at Colinton Parish Church.
The room itself was perfect for our needs. The dresser had plenty of space for two weeks' worth of clothing, the beds were comfortable, and if you leave the window open, you can fall asleep to the sound of the Leith running through the Dell. All in all, it was a great getaway.
Anne-Marie and her family were great to us. Not only did they work with us to help us get our laundry done, but they were also kind enough to let us use their kitchen when we wanted to save some money by not eating out. We had some great chats over breakfast and Anne-Marie and Anita both suggested some great places to see. The whole house is a very caring environment.
If you're looking for a place that you can relax in and still be close to the bustle of Edinburgh's city center, you won't find a place better.