I stayed at Niki's place for a cake research trip to Edinburgh, it was a great location to be able to access the city easily as there are loads of buses at the end of the road that run into the city which is only 3 stops along. It's a simple and quiet apartment with ample space for solo travellers or couples to settle in and recover after a long day exploring the city.
Niki and her partner were super helpful when there were no matches for me to make dinner too! It's 4 floors up so make sure you pack light ;)