Guardians of the Stars
Cruisers are the backbone of most military forces, though Frigates are the workhorses. True Cruisers tend to have a little bit of everything: research labs, hangar bays, ground troops, heavy weapons, and interesting arrays of sensors to perform a wide range of missions. They also include flag bridges for senior flag officers to command from, which makes them the hearts of many task forces and almost all fleets. Solo they can be assigned to literally any mission imaginable.
Even small cruisers usually carry more than one hundred people in their crews and the officers at least will all have their own quarters, even if the non-coms do not. Most of the crew will be engineering or support staff who keep the ship functioning.
Early Space Era