Fantastic!
We spent 2 days in Paolo's appartment and it was really great. We were 2 couples and the flat was perfect. Very well located (5 minutes walk from oxford street, 15 minutes walk from Piccadilly), very clean, warm and quiet. The beds were great, we had really good nights.
We arrived late and Paolo did not charge extra fees, he even bought us some food and drinks because shops were closed! That was so nice!
We were leaving at the end of the afternoon on Sunday and Paolo let us stay as long as we wanted since there were no reservation after us. So we could enjoy the afternoon without our lugages (and if some reservation would have be done, he said we could let our lugages in his office (same building as the flat)).
Next time we go to London, we will definitively book this place again!