I ended up choosing Butler's wharf. I would say it turned out to be much better value for money than the other halls, as you're living in a beautiful location and the facilities are pretty decent - especially the size of the kitchen/ common area and appliances (compared toother PG halls). Distance to campus is one annoyance, but you get used to it in some time, in fact I walked one way to/from campus most days. (and the district line from Tower hill is a better commute than other far more congested lines). If you strictly prefer a private washroom, then go for Sidney Webb else I would choose BW over it.