Nice Hotel in London

Five of us couples will be in London for four nights starting April 25th
next year...I would appreciate any information on a centrally located hotel
that is nice but does not cost an arm and leg with the exchange rate being
what it is between a British Pound and US Dollar.
TIA,
--Jean

Thank you so very much for all your suggestions and help. Since we are all
senior citizens and will have luggage after just coming off a transatlantic
cruise, we will need lifts in our accomodations and would prefer something
that was not dormitory style...we are friends but not family!

I shall peruse all the suggestions that you have sent and send the ones that
I think best fit our group to the couples involved...Hopefully I can use you
as a sounding board when we have selected a couple of them before making our
final choice.

Once again, thank you and I wish you all a Very Happy New Year!

--Jean