We had a fantastic time at Catherine's spacious, beautiful apartment in Edinburgh during the Fringe. It seemed like every venue was only a quick 15-20 minute walk away, with tons of great cafes, shops, and markets 10 minutes in the other direction.
What was especially nice was having a quiet, residential neighborhood to come back to in the midst of all of the craziness of the festivals, and Catherine was very responsive and had great recommendations throughout our nearly 2-week stay.