Visiting London - Advice Needed

Wife and I are visiting London next year at the end of May as part of a visit to some friends in Scotland.
It's been seven years since I was last in London and I didn't have to get a hotel last time. Needless to say I'm a bit overwhelmed with where to stay. lol

My question is, what is the best area to stay in as far as quality and price? I remember the subway being quite easy to use, so an out of the way location isn't off limits as long as it is near a subway line and not in a dodgy neighborhood.

Any suggestions would be helpful at this point.

Thanks..

Oh and if the suggested location is near to photographic opportunities then of course, all the better!!

Go to www.tripadvisor.com and find the London Forum. You'll find lots of recommendations and tips over there.

Thanks, will do!