I only spent two nights at Ms Tong's place, but I would have loved to stay longer. My room on the top floor was comfortable, light, quiet and spotless clean, with a very comfortable bed and a large desk for work (and with strong wifi). There was a shower and a bathroom (with sink, toilet and another shower) on the floor that I had to share with two other guests, but it wasn't an issue at all, I never had to wait (we never even bumped into each other). The area is pleasant, residential, the building is about 5 minutes walk from the Caledonian Road station (on the Picadilly line, so with direct access to e.g. the British Museum, Covent Garden, Leicester Square, Picadilly Circus, the museums of South Kensington and Heathrow Airport). Communication with Ms Tong was efficient before my arrival, and in person she was very friendly and welcoming. I'd recommend her place to anyone who is looking for a peaceful stay in London.