My girlfriend and I spent 5 days in London staying at Gus' place. Everything was as described, an entire bathroom just for us, including towels, soap, hairdryer, etc.
The bed was comfortable and of good size for two people. We were a bit cold the first night, but we solved it with another blanket and turning up the knot of the radiator.
Gus was very kind with us and texted back really quickly every time we needed. He also let us use his own food for breakfast everyday.
The flat was very clean and even if the location is not really close to the city centre, it takes just a few minutes to reach it, with a bus stop at the door of the flat and underground stations at around 15 minutes walk.
We had no problems sleeping in there because is not a noisy neighborhood.
We would definitely recommend it for every stay in London.