Great apartment for a large group that wants to be in the centre of the city. I took a group of 14 schoolkids and it was so much more comfortable and convenient than a hostel. Dishwasher was a real bonus in a well-equipped kitchen, and the Smart TV helped keep them quiet when necessary.
Steps up to the flat might be tricky for older people, and it got quite warm at times (but with 16 people in the flat, that's not a huge surprise) but in general this was a perfect base for us during our brief visit to the lovely city of Edinburgh.