Yup, one bike in the lobby downstairs, one up in the flat (they are swapped on a seasonal basis).
Soon to be two upstairs. Well, it already is, but the other one is in bits, so the wheels are under the kitchen worktop, the frame on the sofa and the other bits and pieces spread about the flat ( I say 'flat', I mean single room-plus-bathroom-bedsit).
We did once count 28 in one of our shared student places, that included the 5 or 6 in the shed, the bits in the backyard, the tandem frame tied to the banisters and the bits in the loft though.