I didn't end up meeting Charlie as he was away during my stay and had a friend let me in (which I was happy with and he let me know before I booked). The apartment is nice and in a good area - the 10 minute walk to the Tube is almost entirely pedestrianised. Everything was clean and the apartment warm. The bed was fine and the wifi very fast. There's even a pub 1 minute walk away (no problem with noise) that serves really good food.
Charlie was nice enough to even leave some chocolates for me.
Overall, a great place to stay in London.