I think 19/20 degrees celcius is pretty standard. I work part time in a shop and my colleagues tend to keep the temperature between 25 and 35 degrees celcius, which really does make me feel uncomfortable. :s
I like it stupidly warm which annoys everyone else. My mum's house it quite big so its never heated enough! I'll have to stop doing it when I get my dog though as they wouldn't be able to cope in the heat I prefer.
I like it hotttt. At home, I always turn the thermostat up to 25ish, and at university I just turn my radiator up to max and hope for the best.
My flatmates must think I'm insane - I have to wear my dressing gown/a big jumper whenever I go into the kitchen and I spend the days (when the heating is turned down much lower) with a big fleecey blanket over my lap when I'm in my room. I really dislike being cold, if that wasn't already obvious.