We just did a week in London and had two rooms at the Park Plaza Westminster Bridge London for a family of four (with teenagers). This hotel is brand new and sits at the foot of the bridge across from Big Ben and within a block of The Eye. Views are incredible. If you can't walk to where you want to go, buses stop right in front and the Waterloo station is close by. It has a pool and the spa just opened. The hotel restaurant is a bit pricy, but there are other options. If you don't mind ultra-modern decor, it's affordable and convenient. We had a marvelous time there.