Just observations.
Laundry is a high risk area with known hazards- electrical, gas, lint, heat sources and combustible materials together, soiled fabrics, treatment for fabrics, oxidising agents, potential for spontaneous ignition of newly folded laundry (rare but it does happen)
Next despite the L1 system you can bet the detector in the laundry will be Heat. Sensitivity and rating??
Fire resistance of ceiling and door?
If people are in bedrooms the chances are that the laundry will not be in use?? Perhaps?
Profile of persons in the six bedrooms- are they bed ridden, could defend in place be a potential option- everyone is ill sometimes? Can they get themselves out of bed or do they rely on assistance?
Staffing levels- how long would it take to evacuate the bedroom compartment- (RSET vs ASET) bearing in mind a fire is likely to be established before the heat detector operates?
Can Progressive horizontal evacuation be achieved or are we next to a staircase with limited options?
Potential for the laundry door to be wedged open???
I am not saying it cant be done - many homes have laundries in bedroom corridors- but it is undesirable. The old green guide used to advise against ancillary accommodation in bedroom compartments.
Is there really no other location for the laundry?