Silent4now, in your favour you are in a very good location. Aldgate, Old Street and Kings Cross are all active areas and a few nstops on the tube from your location. I suggest you avoid outcall; it is a much riskier market and I am not sure if the Hilton is punt friendly.
This WG
External Link/Members Only or
External Link/Members Only is pretty, offers a broad range of services and has a good aggregate. She works during the day and is reasonable (rather than great) value. Read the reviews and please post one yourself if you see her.
Adultwork is the go to site, but you probably don't have time to do the research required. If it helps, i live and punt reasonably close to your location so some my reviews might also be of interest.