Mini roses are too hard to grow indoors. Don't let the size fool you, minis are hardy plants. Outdoors they will survive a harsh winter while you might lose a big one. In my location I don't cover my minis for the winter.
Indoors it's hard to get enough light for them. Spidermites are a problem also. If you like minis in pots just put them in different areas of the yard for color.