Try this website for London hotels.
http://www.hoteldirect.co.uk/london/
Best way to get into London is by the Gatwick Express which will run you into Victoria Station (West End) in about 30 minutes. Go to this website for details:
https://www.gatwickexpress.com/index.asp…
Victoria is London SW1 so you may want a hotel in that area. try;
http://www.londontown.com/LondonInformat…
Whilst you are in London buy either daily Travelcards (or weekly if you are here that long) - these will give unlimited travel on all public transport within Greater London.
I recommend a trip on the river with Thames Clippers; you can get a Rover Ticket £12 (third off with Travelcard) - you can go past H of P right down to the O2 Dome at Greenwich, getting on and off all day; have a look at the Globe (Bankside Pier), the London Eye and see all sorts of other things. There's a replica Golden Hind near London Bridge, HMS Belfast (London Bridge Pier) opposite the Tower. You can get coffee and snacks on board and the boats are great.
Have a look at Oxford Street, for shops
Recommend National Gallery and National Portrait Gallery at Trafalgar Square, Maritime Museum and Observatory at Greenwich (give Madam Tusauds & London Dungeon a miss).
Go to:
http://www.busmap.org/
and download bus maps
Download maps of the London Underground and DLR at;
http://www.tfl.gov.uk/gettingaround/1108…
and, to help you get around buy a London A to Z from any good stationery shop (WH Smith at Victoria station).
Hope this info is useful. Have a great time in my home city and if you want any more suggestions on what there is to see, try the official 'Visit London' website at:
http://www.visitlondon.com/
Keep Safe, beware pickpockets on stations and keep wallets and mobile phones out of sight.