Hot water radiator heat is wonderful, the problem in our old house was that there were 12' ceilings, and I didn't want to replace the original doors/ windows so I weatherstripped as much as I could but it never seemed to be enough (went from that house to a new construction with geothermal-- wow, what a lovely difference that was!).

So maybe the boiler is old and inefficient. Maybe the valve is stuck and not open fully. Hopefully the maintenance guy can help shed a light o n the issue and it can be fixed. And, we keep our house at 68 so we're not too far off of your heat level. Maybe buy a small radiant heater to keep in the room where you are most of the time? Good luck!