I spent 2 weeks apartment hunting in London and used his place as my base. Unfortunately I never got to meet him in person but his neighbor gave me the key and showed me in. It is exactly what it says in the ad; a convenient small room in a quiet neighborhood. The utilies (water, electricity, wifi) were all working perfectly fine and I had a very relaxing stay. There is no washing machine but there's a nearby laundrette you can use.
if you're looking for a convenient, affordable place around London, I'd recommend this place