Hi Karen This rose should do well in zone 5 and it does have good shade tolerance, so you should fine with this selection. I have not grown this rose myself, but it is my understanding that it reblooms throughout the season so it may not need a companion.
If you want a companion,yiou might think about sweet autumn clematis which also tolerates shade and has tiny white flowers at the end of summer. Be aware, though that is a very agressive grower.