Alan is an amazing host. In the first night when I arrived we spent like 4 hours talking about religion, sports, politics, history and so on. Communication is great, always replying really fast and he was really nice to wait as the train was late and I arrived almost 2 hours later than expected.
The apartment is nice, not that big but has everything you need. It's not in the center, it's the first step in Zone 2 of London and from the apartment by subway it's 20 minutes to Big Ben. Subway station is close, 8 min walking.
Overall I had a great experience and hope to see Alan again. The only thing to consider is that I visited London in early November and it was cold outside and also in the apartment.