Steve is a nice guy and means well. After my brief frustration about getting from him details about his location, he sent me a link to a government website and a "Cheers".
He seems uncomfortable around women as he uses profanity every other word. I was really offended with the vulgar language, so after a couple of conversations I kept to myself. He did have another American guest from Australia to chat with.
Expect an 1-1.5 hrs each way to center of London each day (buses don't run often on weekends) and a bus to get you to the metro.
I stayed for a week, my room was at the front of his apartment and open to the noise from traffic. It was hard to fall asleep and at times woke up in the middle of the night. On the plus side, it is close to a public park where you can bike on those days you're not up to going to the city.
Except for occasionally leaving the kitchen a mess, with leftover takeout, garbage, grease, egg shells in the sink, etc, the rest of the place seemed clean.
If you don't mind any of the above, by all means, go for it.