trying to choose a hotel for a night during the Olympics on points, 50.000.

The following hotels are available:

The May Fair
Radisson Blu Edwardian Leicester Square Hotel
Park Plaza Westminster Bridge London
Radisson Blu Edwardian Mercer Street Hotel
Park Plaza County Hall London
Park Plaza Sherlock Holmes London
Radisson Blu Edwardian Grafton Hotel
Park Plaza Riverbank London
Park Plaza Victoria London

The venue will be at the Horse Guards Parade. Which hotel should I choose?

The May Fair looks nice but reviews on Tripadvisor do not seem to be particularly good. The Park Plaza County Hall London and Park Plaza Westminster Bridge London seem to have great reviews.