I stayed at Simon's apartment for 6 nights. Simon was nice and welcoming; his apartment is conveniently located close to King's Cross train and underground stations. It's on the 7th floor of a 9-story concrete block building that was bright on sunny days but dark and dreary on rainy days and at night.
There was only one working lamp in the living area (that I didn't find adequate enough for reading a guidebook or looking at maps) and there was just a single overhead bulb in the bedroom (a 15 wattage nightlight was the only other light in the bedroom). Simon did provide a replacement bulb for another lamp on my 3rd night which I used in the bedroom. I had problems with the internet connectivity in the bedroom and Simon replaced the router while I was there.
Simon also has a finicky shower situation; the faucet handle is detached/broken so that one can't adjust the water temperature. Simon checked the temperature when I arrived but something got off kilter so the temperature became so hot that I couldn't wash my hair. Simon told me the faucet handle wasn't broken, just that I wouldn't be able to adjust the water temperature myself...
I'd caution other single women travelers about this location; I returned late one night to find some of men doing drugs near the entryway to the building which always smelled like piss (probably from dogs). I would choose to stay elsewhere the next time I'm in London.