The communication was great, and so was the apartment. Sadly, I didn't make it to London myself (which I deeply regret), but my travelling companion did, and here is her comment:
"I spent a great time at James's flat! It is spacious, modern, it has everything you need and a balcony! I had no problems at all. It is very well located and it takes about 20-30 min to walk to the city center. The area is nice and quiet, there is a Tesco shop nearby that closes late and a tube station is just around the corner. James's friend Jesus checked me in when I arrived and was very helpful. Both James and Jesus responded very quickly when I had questions or needed help. Thank you, guys! I hugely recommend this place!"