<human>: Condense the text into a few key points

This question is rather general so let me know if it isn't allowed. 

My husband and I have been married for 5 years and we've been friends with Aaron for like 12, close friends for 8. He is our mutual friend (we all went to the same high school, he and hubs went to the same college. Husband and I didn't date until after we were both out of college.) 

I recently got a kick ass job in a new and much more expensive city. To help offset some of the costs we decided to see if Aaron was interested in moving. We knew he was looking for a change and thought this would be mutually beneficial. He agreed and we are all moving next month. It's been at least 6 years since any of us had roommates and we haven't had roommates past college where everything is much more chill. I was wondering if anyone had any advice or tips, ideas for things that need to be discussed now rather than later, etc. Some important details: 

- Looking at 3 bedrooms, 2 baths. 1 room for husband and I, one for Aaron and 1 guest/hobby room. We would have a separate bathroom from him. 
- Majority of the common area furniture and kitchen stuff will be provided by husband and I. We want to make sure he feels like it's his home and not just like a room he's renting.
- Aaron doesn't drive for reasons outside of his control (not a DUI) but the city has ample public transit. 
- There has literally never been anything even approaching romantic between me and Aaron. Thought that was worth putting out there. 
- In case of extreme circumstances we are making sure we could technically afford the rental should Aaron move out.
<bot>: My husband and I are moving to a new city with a friend next month. It's been a really long time since any of us have had roommates. Tips? Advice? Things we should discuss now?