Our experience at Alessandro's studio was like many of the others' who have left reviews here, I expect.
The place is exactly as it is described, no more, no less.
Very comfortable and intimate--perfect for 2. I would not recommend this place for a couple with a child, however; as it is quite tight once all your luggage and stuff is inside.
The location could not be better. In fact, it's the most attractive thing about this place. The studio is located on a quiet street, but only a stone's throw from everything you'll want to see in London.
Alessandro's directions are extremely helpful, and check-in was a breeze. We were greeted with a bottle of red wine on the table and snacks and bottled water in the fridge.
The downsides: walking up four flights of stairs after traveling or walking around all day; the shared bath is not as private as you'd like; and the temperature in the studio in June is a little stifling, while opening the window let in a ton of noise in the early morning.
Aside from that, we really couldn't complain. Very good value all in all.