We visited the flat for the second time and it still is exactly as described.
It is indeed very small but at a very high standard. The bed is big and comfy, the shower better than anything else we experienced in London.
Annette was extremly helpful and easy to communicate with. She even had a sign put up welcoming us.
The neighbourhood is quiet ans peaceful. Hammersmith station has 4 tube lines and a big bus station. With the tube it takes about 15-20 minutes to city centre.
We will keep coming back!