We are a couple, we stayed at Gadi and Gili’s place and it was absolutely amazing. The flat is beautiful and so comfortable (Tempur mattress! Underfloor heating! Gorgeous bath!) and spacious. The cafes and restaurants around helped us have a fresh start every day. Belsize Park is a beautiful neighbourhood. It was much better and authentic than staying in a hotel. We actually felt at home.
Gili and Gadi were abroad but they were super communicative and available and helped us in anything we had asked for. If this place is available don’t think twice.