Very modern flat with AC/dishwasher/washer/dryer.
Main room with king bed, second room with twin beds and third room is all adapted for kids (with crib incl. if needed). Sofa bed in living room.
Theres space to work and the whole flat is adapted to kid/toddler with corresponding utensils (i.e high-chair, bath etc).
Condo has study rooms and kids playgrounds and indoor playrooms as well as a gym. Right on HBS campus.