This is a great location, very close to the Meadows park and with a great coffee shop down the block. The space is quiet and Annabel is a thoughtful host with lots of interesting items from her travels throughout the home. The sofa bed will be fine for most, but if you have back problems it could be uncomfortable. When I need firm support, putting the mattress on the floor does the trick.
I can recommend this as a safe and comfortable place to stay in Edinburgh, and I'd also recommend checking out the nearby coffee shop -- Victor Hugo -- for an excellent cappuccino. Enjoy!