Futons generally have pretty comfortable matteresses. Air mattresses are pretty good, too. Some older guests do not like being on the floor, making a futon a better bet. Tell your son to clean the bathroom before guests come. I've been making my son de-grotify his bathroom before guests come for years. You might need to give advice the first time, rather than handing him bathroom cleaner and a sponge.

Something like the EZ Inflatable should suffice. If you put the guests upstairs, maybe the 16 year old could use the bathroom downstairs.

When we had(before covid) guests, they would share with my then - 15 year old. I kept an eye on keeping the bathroom clean. I sure could not rely on my 15 year old to do so(he cleans it every week, but not for guests).

Thanks that what we are thinking we debated about murphy beds, guest beds, etc. but I think an air bed will work. In the past we give my Mom my daughters room, she has bathroom in her room. We may still do that for her. When my cousin and her husband, came over we gave them my sons room, and our son stayed in his sisters room. ( they were younger then) I think for the very few guests we get a year we can just get an air bed for in the office in basement. I feel like some of the air beds have come a long way. Would love to have dedicated guest room but just doesn’t make sense, my daughter and I will get way more use out of a craft room upstair. (She would love the new basement bedroom but considering her Dad did all the labor for the basement he should get the new room😉

I don't feel an air mattress is a great option for adult guests. They are great for tween sleepovers etc, but unless you can find a good quality one with its own fold up legs, so it isn't sitting on the floor, they are a long way down for older adults. I've also found they are prone to leaking - we've had several that just haven't lasted well with normal use.

In my experience Futons also aren't comfortable.

Would you have room for a day bed?

Ikea has some ideas but this one has always been my favourite. When not extended it is a twin sized daybed but can be extended out to king size with another mattress.

It would be nice for the office, a place to lounge or curl up with a book, and then pulled out to accommodate a couple or kid sleepovers etc.

Ikea has other options as well for day beds.

It is a reasonable price and likely to last longer than the air mattress option

HEMNES Daybed frame with 3 drawers, white, Twin - IKEA · More Info

Do NOT get a futon. They are bulky and awkward when in sofa mode and not that comfortable to sleep on. I personally would never ask a guest to sleep on an air bed either because I have never had a good night's sleep on one.

Some of the IKEA options for sofas that turn into beds would probably be a better option for the office than a Murphy bed if there is room because then there's also a place to sit and think or nap in the office.

I think air mattresses are fine. We used one for three months when we moved. It was a double height queen size, so the same height as a regular bed. I like the ones with the frame better, but a little more pricey. We had a mattress pad and regular sheets, no problem sleeping. You do have to top of the air almost every night though, but not a problem since most have a switch in the back for air pump.