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Twin/day bed for sure! I find the other options aren't as comfy.

@skipra: I also think a trundle bed is the most comfortable option. Way better than a pull out couch.

It depends on how much you want to spend and who you have staying with you. If you've only got single people, a daybed is okay (I'm not personally a fan but I'm probably an odd one out -- they just seem confining to me and I like my space). But they're too small for couples and trundles just seem weird for a couple, too... There are some AWESOME pull-out couches but they tend to be $$$. My friend has one by American Leather and I swear, the nights I visited were some of the best sleep I've ever had.

@PurplePeony: I have a pullout from American leather that has a tempurepedic mattress. People love it. It was pricey, but we get a lot of visitors living in NYC.

We have a twin daybed but it's a trundle that the under mattress pops up to make a full when needed. It's great for guests (couples) and doesn't take up much space!

I really want the IKEA Hemnes daybed - we could use it to lounge in the playroom and then it pulls out to a double so two people can sleep on it when needed

Hmmm...I'd probably vote first preference as a nice sleeper sofa or murphy bed. But if it's not a nice one, either of those can be pretty miserable. So in that case, my next choice would probably be a double-high air mattress (with an extra blanket between the mattress and fitted sheet if it's in the winter because they suck the heat from you!).

I'm not really a fan of trundle/day beds; even if the levels come together, the gap/crack in the middle can be annoying. And if I'm solo, I'd rather just sleep on a couch

As long as we only have one guest we always put them in our spread bedroom with a twin bed. We have a pull out queen in the basement and have only used it once or twice.

The only thing I would be fully against is a pull out sofa where you have a bar in the center of the mattress, horizontally. For that reason, if you need a sofa, I would get one of those IKEA sofabeds that fold in half and the split is in the center, vertically.

If you do a pull out bed, they make ones now that have built in air mattresses. They're actually really nice air mattresses and being up off the ground also makes them a bit more comfortable. I'm with @looch: on the couches with the bar. SO uncomfortable!

My mom has a twin/trundle day bed for when I visit, and it's like a regular bed, so it's comfortable.

I've slept on air mattresses I've loved, and on air mattresses I've hated. But there's nothing I hate more than sharing an air mattress with my husband (who is 6 inches taller and 50 lbs heavier than me). When he moves, I move. So if you expect a lot of couple guests, I wouldn't go that route.

There are some nice pull out sofas out there. We have one from Blu Dot that we really like.