I would highly recommend staying at Martin's place while you are in Edinburgh. The apartment was clean, quiet, and had perfect amenities if you want to cook for a night in. The location of the apartment is perfect - you're very close to restaurants and nightlife in the Grassmarket and a close walk to the Royal Mile/Edinburgh Castle. Martin was also an exceptional host, and greeted us when we checked in to explain the ins and outs of the apartment as well as give us tips on what to do while we were in Edinburgh.