A fabulous location from which to explore London and beyond. We stayed a week and found it to be just perfect: just as Fiona describes it, close to everything in the city, but also in a location that is rather quiet and calm (great combo).
It's 8 minutes to the Tube station (Pimlico) and 2 minutes to a bus stop and just a few minutes to Wilton Rd. where there are lots of fine places to eat. We LOVED Pimlico Fresh (86 Wilton Rd.) for their fantastic fruit smoothies (unadulterated fruit) and food (all things on toast, oatmeal, french toast, etc.). Ate there as much as we could.
I think it's impossible to find something in London that is more than one tube transfer away from here. One more transfer and you're on the national railways to Oxford, Cambridge, Essex, and beyond.