Location is key in London - you do not want to waste too much time and money for complicated transport arrangements . South Kensington is one of the most upmarket and safest areas in London, meaning you can take the underground even late at night, and you will arrive home safely. You have all kinds of lovely cafes, bakeries , restaurants and supermarkets in the lovely neighbourhood - as well as two major tube stations with red double decker buses leaving from there in all london directions.
And of course all the Museums, Harrods, Kensington Palace , Royal Albert Hall, Kings Road and Hyde Park, ... .are all in very close walking distance.