Hi Pinkcowprint.
I am from London and go there (work related) often - it's excellent.. start in Matthew street vodka Bar 'Revolutions' and within 10 feet either way from there you cant go wrong.
I would say the IBIS (you can walk it - but when all dressed up is only 3 quid by cab to Matthew Street). Normally not the greatest hotels, but this one is fine. Nice rooms (no room service) But when staggering back from a night out they keep the bar open.. nice chepish proces - approx 50 - 6- a night (for a double) !!
have a great time