I enjoyed a long weekend in this flat while traveling on business. In terms of proximity to major tourist sites the Clerkenwell neighborhood is not at the top of the list, however for an affordable stay and comfortable living it is great. Within a few hundred meters there are grocery stores, a variety of restaurants, and several gyms that offer pay-as-you-go memberships. If you visit on the weekend I highly recommend the Sunday roast at "The Peasant" just up the street. The flat itself has a great character and the full, curved wall of windows at this corner location brings in lots of light and almost makes the dining table feel like its on a patio overlooking the street. Strong internet and a stand-up desk made working very comfortable.
If Clerkenwell works for your London plans, this is a great choice of flat for a single or a couple and would be suitable for more people willing to pile in and use a futon in the main room.