If I go back to Edinburgh I would definitely go back to Renata's place. If you rent a car during your trip, you will be sure at least you can park it and from Renata's place you can reach the center of the capital either by bus or taxi without spending too much.
It is a great place where to stay and Renata is also a wonderful host. Her place had everything you might need to feel at home and Renata also makes sure to make you feel comfortable and provide you everything you might require. We really loved staying there and we definetely recommend it.