Sleeping Arrangements

[Ovid]

A friend writes:

  We will be in London between January 1st & 5th around a month
  from now. We were wondering if you had recommendations of
  reasonably priced accommodations within London proper or 
  within an easy commute on the Tube.

Frankly, the only hotel I've stayed at in London was Hotel 55, out in Hangar Lane.  I think he wants something more central.  Can anyone recommend anything?

Cheers,
Ovid
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