Everything went great on our trip. Sam was helpful, and accessible, sending us numerous messages on the day of our scheduled arrival to ensure everything went to plan. The apartment was perfectly located in the centre of the old town, 2mins from the the train station, and was a great place to stay. It was very clean, had all the essentials we needed and gorgeous views across to Princes Street. There were a few very nice places to eat on the same street - we visited a lovely Italian practically next door! - and was very close to attractions like the castle and only a short walk to Princes Street across the bridge. In walking distance to practically everything, we even walked to Arthur's Seat from the apartment which was lovely.
I would definitely recommend to anyone travelling to Edinburgh!