We had a wonderful stay at Michael's apartment!
He was very agreeable and smiley, and flexible to adapt to our early coming. His flat - both absolutely pleasant and comfortable - is located in a lovely neighborhood close to the underground, which brings us very quickly in the center. It also looks exactly like the pictures.
We found everything we needed to perfectly enjoy our stay, especially a good sound system to plug and iPod, a good wifi connexion, adaptors for french plugs, and above all a very comfy bed! When you walk over 10 miles a day, you really need that..!
Needless to say we did love to discover London, and we'll definitely come back at Michael's place to explore it even more.