David's flat was amazing and a seriously great place to stay. You could see the castle right from the window of the bedroom. It was very centrally located, close to public transport and tons of shops, stores, and things to see. Though we missed meeting him, David was a gracious host and left a whole bunch of useful items in the flat, like shampoos, breakfast supplies, guidebooks...even chocolate and wine! We used the couch's pull out bed and even that was pretty comfortable. I'd highly recommend staying here and hopefully I'll be able to stay again the next time I visit Edinburgh!