Well, a couple notes: 1. Living together doesn't necessarily increase productivity. If you actually started a company together, one of your homes/rooms would p

Well, a couple notes: 1. Living together doesn't necessarily increase productivity. If you actually started a company together, one of your homes/rooms would probably become the startup's 'home' anyways. 2. Living with him will quickly tell you how well you'll get along in the long run, something crucial to business. If you find out you don't work/live well together, you can move elsewhere next year. TL;DR- Go for it, live with him. Worst case you learn that you don't really want to start a company with him.