We absolutely LOVED Emma and James's flat in London. It's in a fab location (seriously, it is such a cool area) and so spacious as well, for a central London flat. James and Emma checked in on us by phone a couple of times over the weekend on arrival and the day after, given there was an incident in London that weekend, they were keen to make sure we were OK.
Clerkenwell is a super little area, quiet during the day but with a bit of a buzz at night and only 20 mins on the bus to the City.
I'd happily recommend this flat to others, it's amazing and would love to stay again!