I chose Tufnell 🏠 in London.
About £300 a week should be fine, depending on your budget. The room is spacious, with a large double bed, a dining table, a long desk, and 24-hour security at the student apartment's office. There's no shortage of amenities like a gym, study area, and laundry room, and if you lose your key card, you can easily get a replacement at the front desk. It takes about 20 minutes by bus or subway to get to Saint Martin's and 22 minutes to UCL. Plus, there are two supermarkets within a leisurely ten-minute walk, making life quite convenient.