re: Mid-priced Hotels in London

Little secret: Pub accommodations have improved to an amazing quality. These are historical rooms above pubs, some with a separate side entrance, and most in London proper have been done up incredibly well. It's a great vibe, and my GF and I have been to many of them now since we go to London once every few weeks, and no noise problems.

Prices are usually under 300 GBP

I recommend:

The Bull and The Hide
The Fox and Anchor
The Hand and Flower
The Alma
The Grazing Goat