That Oh Me, Oh My place is pricey as people say, but also be aware when I went last time they had ONE toilet which was mixed, I am talking a tiny cubicle and around 20 people queuing to use it. Not sure if things have changed since, it could be that the building work at West Africa House at the time had something to do with it, there was bags of cement and crap all up the stairs.
That said, the views are amazing.