Bricklayer needs alittle help from the elections

The Gf lives in this apartment and maintenance is sketchy. She is running a space heater in the bedroom and keeps blowing the #13 breaker for bed room,hallway,bathroom and light in kitchen. Not the electric stove,microwave or fridge. I have no problem changing breakes but not sure what kind these are. Haven't taken the cover off to see what amps the breaker is. Also I moved it off that breaker and hasn't tripped another breaker. Small apartment 4 units in the building. Just seeing if it could be a bad breaker? I've been shocked enough through the yearsl, so let me know what you think, Thanks.