Six to eight hours of at-a-stretch sunlight coming from your south facing window, is optimum for your potted plant provided there is enough ventilation in the area as well. Moderate heat is what roses require in order to thrive beautifully.
If you want your flowers to grow up nice you are going to have to go ask somebody that know a lot about flowers. This matters to people because they don't want a bad job on working on something they really like something. This connect to my life because when I was like 6,7,8 i really didn't like flowers and they had me taking care of it.