When my husband was scheduled to attend a conference in London two years ago, my son and I tagged along. The conference was held at
Imperial College . Classes were in session, which meant no university housing was available, but there were a number of hotels there in South Kensington where the attendees could stay.
We stayed at the
Grange Strathmore Hotel , which was a lovely townhouse hotel. It was near the Underground, the Natural History Museum, the Science Museum, you could walk to Harrods... The location was great, our room was lovely, and we had no complaints with the service whatsoever. It's priced at about £100/night, as Wendy was mentioning, but is ranked as a 3+/4 star hotel. If you have to spend that much, might as well stay in a nice place.
Kathy