I spent 11 days at Alex's flat with my mom. The place is very well located, the area is nice and quiet, with good public transport options. I'm a seriously light sleeper but neither the traffic nor the neighbours bothered me at all. The internet connection was reliable, the bed comfortable (well the sofa bed is still a sofa bed, so if you have a bad back I suggest you pick the very comfy bed in the bedroom). The kitchen had everything we needed for our stay and there are many shops nearby.
Alex accommodated out late arrival and departure graciously, and we had a great time in London. I can only recommend his place!