It really depends on your budget where you would like to stay in London.
There are some fantastic hotels which are very luxurious. You could check out the link below though for an idea of what would be available to you. Also you could plan ahead and look a the
Nightlife or the Tourist attractions like
Big Ben or
Buckingham Palace
It is a fanatsic city and i am sure you'll have a wonderful time
http://www.destination360.com/europe...don-hotels.php