Daniel's flat is perfectly located for exploring/accessing Greenwich, the Thames environs, the City, and generally east (Docklands, O2 arena etc) and central London, though transport links are very good so I wouldn't hesitate to stay here "doing" London in general -- it is literally less than 5 minutes' walk from a train station or a bus stop.
Twin room (ideal if you have two people who are not a couple!), a great shower, lovely apartment with character, on a quiet, leafy street in a pleasant area and a friendly, accommodating host -- all in all, very good experience and highly recommended.