We had a good week in this flat, which was a stone's throw from Regent's Park. The hosts were flexible with the check in times, the location is excellent, and it is a good size for a short stay (we stayed for a week).
The main issue was that the kitchen was missing some basics (oven tray, chopping board, cereal bowls etc) and the extractor fan wasn't working, which was an issue in a studio flat - they did offer to send a contractor while we were there. Also, the fridge is small and only has a small freezer compartment. The flat was mostly clean, though there was dirty cutlery, a sock under the bed, and the bathroom sink needed a wipe.
They were responsive about the issue with bathroom ventilation, which was fixable, and there were plenty of towels/sheets etc. Good double bed, big wardrobe, nice table and chairs, washing machine, and easy check in/out.