Booked at Graham's because of a nearby conference I wanted to attend. Due to unforeseen circumstances, most of the conference talks were moved online and I spent almost the entire day at Graham's watching the presentations.
Graham is a very nice man, easy to talk to, the house is clean and overal it's a pleasent place to stay at. The room has a simple layout, which is absolutely fine if you're visiting London during the day. Obviously, it was never meant as a place to spent 8+ hours watching a conference, for which I'd recommend a different type of room.
The location is ideal, as it is nearby many shops, pubs, good restaurants and a supermarket. The Underground connection is a 20min walk.
Comfortable bed as well, though I wouldn't recommend it to people much taller than 1.85m.