We had great time at John's place - the location is great, just 7 minutes walk to the subway which takes you anywhere in the center within 20 minutes. Neighborhood is also very nice - there are a lot of bars around, Broadway and Columbia markets are just a short walk. If you love jogging or cycling - bank of Regent's Canal is also just three minutes walk.
Apartment is clean and bright, room itself is relatively small, but it was perfect for us as it had table, wardrobe and very comfortable bed.
John is a great host, he provided us with very detailed instructions of how to get to the flat, and recommended nice places around. He also was so nice to offer some food for breakfast.
We highly recommend this apartment and will be happy to stay there again.