The room fuse in my '99 626 protects _ignition-off_ function of the power door locks, headlights, and some other functions, IIRC including all operation of the radio. For example, if the Room fuse is blown, my power locks work, but only with the ignition switch on. Doc
The fuse box of a New York apartment can be located in quite a number of various locations around the apartment. Generally, fuse boxes are located in the basement of the building or a supply or storage room or possibly a maintenance room.