The flat was clean, tidy and well equipped. We were greeted with tea, coffee and milk. It felt a safe place to stay and it was perfect for the 3 nights we were in London. It is in a great location for us with proximity to tube stations, cafes and supermarkets and is walkable to central London.
O'Neil was very accommodating and responsive, even when we contacted him quite late at night due to an issue with the hot water. Although we were faced with a couple of issues while staying in the flat, O'Neil responded quickly and attempted to resolve them promptly.
One thing to note, the flat is on the top floor, so there are a couple of flights of stairs to climb.