When there's a listing that states "X 1/2", it means that there are X rooms in the apartment. A 4 1/2 is usually 2 bedrooms, a living room and a kitchen area -

When there's a listing that states "X 1/2", it means that there are X rooms in the apartment. A 4 1/2 is usually 2 bedrooms, a living room and a kitchen area - the ad will usually indicate if this is not the case.