Certified GKH Gardening Expert
Most houseplants seem to play nice with the Begonia, actually! As long as you choose something that is not particularly fast growing, it will likely take to just about any houseplant that you plant with it. There are exceptions, like with Kalanchoe, but there aren't many.
This article will offer more information:
https://www.gardeningknowhow.com/houseplants/hpgen/growing-companion-houseplants.htm
This search link will take you to a page of results that you will find helpful, as well:
https://www.gardeningknowhow.com/search?q=Companion%20planting%20with%20Begonia