I have three main heat sources in my apartment, the freestanding oven in my livingroom, the floor heating in the loo, and a wall-mounted heater in the bathroom.
Because my bathroom is enclosed by rooms on all sides, I don't always have heating on in that room to save on electricity, and it's always off in the warmer half of the year. The floor heating in the loo is on during the colder months and off in the warmer months. The livingroom heater is adjusted depending on the outside temperature and I turn it off once the outdoor temperature is more consistently bearable, which usually means sometime in April or May depending on the year. I don't have any heating on in the kitchen, but it naturally gets heated when we cook food, plus there's only a thick curtain separating it from the livingroom so it doesn't get too cold overall.
My two tenants have heaters for their room that they use how they want, but I don't have one in my own bedroom, because there really isn't a need, not even during the coldest part of winter.