!. Find a bed that doesn't jostle your partner when getting in or out. Protect their sleep.
2. Get private time by getting up early.
3. Give private space before asking for some.

"..how well do you find sharing home space works for you?"

I like living with my partners. It feels good to have them close.

"Are there guidelines, suggestions, ideas, etc. that you have learned work well?"

Treat each other like adults. I guess it can depend on how one defines adults, here, but we seem to figure it out without a lot of hassle. We ask and interact in ways that are straightforward and helpful. No drama or unspoken things, no resentments building up, or crap like that.

"Are there things you have learned that can cause trouble?"

Resentments and hard things lasting too long. Unresolved stuff lasting more than a day or two.

"What three pieces of advice (well, three or less, let's say) would you offer to someone who was thinking about shacking up with someone?"

1. Try to make sure that everyone has a place where they can go when things get weird for them. For adults, this might be a room, for kids, this might be a room or a treehouse or just some place that is their sanctuary.

2. Courtesy, friendliness, and helpfulness go a long way. A long, long way at times.

3. Everybody's an adult, but we're not islands, so it's good to respect each other's privacy, and allow for independence, but remember that we're together because we enjoy the company. We're a group because we are pleased to be a group -- and we treat each other accordingly.

"What advice can you offer that is specific to multiple partners (most living-together advice is pretty much germane to any relationship), if any?"

Right now, my opinion is to make sure all wills and powers-of-attorney are taken care of. Make sure that everyone who needs to know where things are located, knows this information. I recommend actually hiring an attorney, or some other professional to be your executor, instead of a relative, friend or (fuck!) an ex. In the case of multiple partners, this kind of business can be especially hairy.