It's literally on the doorstep of the O2 so perfect for any event there, or simply taking advantage of the myriad restaurants or the cinema in the O2.
The Spa is also large with a good pool,
sauna and steam room. I also really enjoyed the Meridian Lounge, with coffee and cakes delivered to you regularly by an attentive staff.
It's close to the centre of London as long as the Jubilee line is working, so just check it isn't closed for upgrades when you are visiting.
Two minor niggles compared to other London hotels - the free wifi was a bit slow and sluggish (you could pay for an upgrade, but I've had better free experiences in London); and the minibar selection was more limited and more expensive than some other London hotels I've stayed at. If you don't use those, then you have nothing to worry about - it will be a great experience. [Less]