While the flat on George Street is in a great place from which to explore Edinburgh, be aware that it is 75 steps from the sidewalk up to the flat. However, once you make that climb, you are treated to great views of Edinburgh Castle and the Firth of Forth from the windows in the unit. There is plenty of space for a small family or one or two couples.
There are some issues with the flat that you should be aware of before renting it. The internet service to the flat is extremely slow. We could try to stream from one device in the unit, but even that was not smooth. Trying to do anything with two or more devices led to a failure on all of them. Altido should really look at alternate internet service providers to get a decent download and upload speed in the flat.
The bigger issue is with Altido's response to problems, or rather, their lack of response. While they did respond on Airbnb to us when we reported things that weren't working in the flat, the actual solutions/repairs were slow in coming. In several cases, they never fixed issues during our entire 9-week stay. They really seem to be optimized for short weekend stays in the city (and that appears to be why many of the other clients staying in the building were there). We reported a number of appliance issues. Some were fixed very slowly – a broken washing machine took over a month to be replaced – while others were just ignored by them without even a message telling us why they wouldn't fix the issue.
While we had a great time exploring Edinburgh while being based on George St, we cannot recommend staying at this property due to the lackluster management by Altido.