Libby's flat is a great option for people who need a base to explore London or are there for work. It is clean, functional and nicely decorated - and is part of a quiet and well kept council estate. The position (10 min walk from Farringdon station) is handy if you need to reach Gatwick Airport (train from Farringdon) or St Pancras (1 stop away).
The flat sleeps 4, but bear in mind that once the sofa bed is open there is little space to move - this is fine if you are a tight group (I stayed with my parents and for a very short stay), but it could be a bit of an issue for two couples, or for longer stays with more than 2 people, or if you are looking for space and privacy while travelling in a group.
That said - for what we needed, we enjoyed our stay and would recommend the flat !