if you go for full room heating, insulation really is everything. wall, floor, window, door, if you want low running cost with full room heating, you really need to find and fix the heat leaks.
the good news is that when you invest money in insulation, and your bills are lower month after month, it pays for itself after a while.
Yeah but not much I can do at present time. Trying to convince the roommates to spend a bit more so we can get a nicer place. For right now I added the plastic insulation and thick curtains to the window.