We stayed at Martin's for a weekend.
He was a very nice host. As discribed he just stayed in his studion on friday and monday. So we got the appartment all for ourselfs.
The appartment was very clean and comfortable.
I really enjoyed the jaccuzzi ^^ and my husband was greatful for a "real" coffee maschine ^^

If you don't mind walking a bit to the next tube or taking the bus, it is really good to reach.
I will recommend Martin's appartment anytime to my friends...