Me and my girlfriend stayed at Thierry's place for three nights in mid-July. The location was perfect for the errands we had to run and the meetings we had, on south bank and around Holborn/Covent Garden - all within walking distance and with loads of buses from practically right outside Thierry's door. Waterloo tube station is also conveniently very close, and so are loads of nice cafés, restaurants and lovely riverside walks. The London Eye, Tate Modern and Houses of Parliament are among the attractions very close to the place.
The apartment is not huge, but absolutely perfect for singles or couples. It's modern, clean and neat, with all amenities and is very tastefully furnished. When we had time, it was a great place to relax.
Thierry - although he was out of town so we didn't get to meet him - was an incredibly gracious and helpful host. He was very helpful and responsive to any questions we had and even left us his membership card for the Tate Modern (very nice!).
We can definitely recommend Thierry to anyone looking for a place to stay in London!