Staying at Terry's was a great introduction to London. The room is on the second floor of a beautiful, clean and well maintained Edwardian terraced house. The window overlooks the path to the back garden. Terry is a very mindful and attentive host who is also full of opinions and has impeccable taste, so ask him for recommendations before you do anything.
Connections to the center are good, especially buses (I rode the 68 to Bloomsbury most often) and commuter trains (most often the Thames Link and the Southeastern). The Tube is just barely too far to walk to comfortably, though I did it several times anyway. Brixton is the closest station, and it is close as the crow flies, but you can't walk straight to it because there are railroads in the way--you have to walk through either Herne Hill junction to the south or Loughborough Junction to the north.
One thing to take note of: the desk setup is not intended for work from home, as the chair has a straight back and no cushion. You probably can tell that from the photos, but I didn't think about it and ended up having to get a different chair. I'd highly recommend Terry's place if you plan to be out most days and want a quiet and comfortable place to return to, and you plan to be horizontal most of the time you're home--the bed is very comfy!