Yeah, we considered taking other factors into account such as whether the room was at the quiet front or noisy back, or whether it was 1st or 2nd floor (due to proximity to neighbour on ground), and even the volume of the rooms (as the two biggest are identical in plan but one has a sloping roof on the side), but everyone seemed happy at the time.
I think the smallest room in ours is £190 then two @ £200 and two @ £230
~£500 extra per year between largest and smallest seems fair