To choose a comfortable pull out loveseat sleeper, you need to look for a model that ensures maximum comfort both when you’re using it as a couch and as a mattress.
This means that it should have a sturdy and reliable frame (hardwood is the best choice, but you can find some good metal models, too), enough padding, and a good mattress.
Depending on your preferences and sleeping habits, you can opt for:
A traditional spring mattress that gives you a bit more bounce and different levels of firmness to choose from
A memory foam mattress that will conform to your body shape, relieving pressure.