For the guests, shove things in bin bags and stash them out of the way in a bedroom so they don't see them. Push the vacuum cleaner about and that'll do.
On Monday, you can do something to start getting the crap out so you feel better.
Sort the bathroom so it's just got what you need in there - bubblebath, soap, a few clean bath toys, toothbrushes, toothpaste and bog roll. You don't need ten thousand dusty bottles of things and rubber ducks that are mouldy inside. Bin everything else.
After a cuppa, clean the room. Make it gleam.
That's your lot for morning.
Then in the afternoon, do your bedroom. Open the windows. Strip the bed, vacuum it, put fresh linen on. Have a cuppa. After that, wipe the windowsills.
If there is stuff on the floor, scoop it all up and bin anything not perfect. Vacuum the floor.
Assuming that your DH has handled the kitchen, you've now got somewhere to prepare food, somewhere to get clean and somewhere nicer to sleep.
Just keep those three rooms OK for Tuesday and Wednesday, go out, even if it's raining, each morning. On Thursday, do a corner of the living room. Do a bit on Friday.
It's different to cleaning professionally - for that, usually the place is already tidy and you are completely undisturbed by Muuuuuuummmmmyyyyyyyyy. You'll have a set number of hours, too, so it doesn't feel endless - it's just two hours and you stop. Try that by doing no more than two hours before a proper break, fifteen or thirty minutes before you stop and have a cuppa.
Seems like you're at home by yourself with toddlers/babies. How long until the eldest gets preschool/nursery sessions? It'll improve once you get out every day for drop off and pickup, as being outside is good for you mentally.
You don't have to like it, but it's a lot more manageable in chunks like that. And I'm pretty sure you know it's not fair to expect your DH to do it all - it sounds like he isn't managing it completely, anyhow - help him out a bit.