Actually, the warmth in the bedroom, I just noticed there’s a roof terrace attached, hadn’t noticed that before o.o ?! Anyway, so you have a larger glass surface on the south side, which also means the room will warm up more. Also, the bed is placed directly in front of this window front. I always had the balcony at the bedroom too... never used it, just looks nice but that’s the truth. No one goes out on the balcony in a bathrobe in the morning. Also, this nice part of the house is thus completely privatized, or do you want your guests always trampling through the bedroom to enjoy the amazing view? The room is 27 sqm so maybe something is possible with a clever partition wall. I’m just thinking about how it could be done, but that’s a matter of taste. It just occurred to me!
Fireplace.
So for me there are basically 3 options.
You could do without the door between dining and living room. Just make a passage there and use a fireplace with a see-through combustion chamber. The advantage is that when dining, for example with guests at a goose feast, your fireplace fire can be admired.
Another option would be to install a three-sided fireplace at the end of the partition wall between living room and dining, which would then protrude somewhat into the living area.
3rd option would be near the stairway wall in the living room. Disadvantage is less space there, but more in the current location and possibly better variation options for the placement of the audio equipment, see problem entrance and living room which I already mentioned!