Bloody hell YANBU!!!!
We lived in a 1bedroom flat when DC1 was born & it was so lovely and cosy just us 3 there
Also I was secretly relieved we could easily say no to any guests staying over!
Plus I had a CS so it was great to have no stairs in the home (lift in the appartment block so no lugging stuff up the stairs)
With DC2 we'd only progressed onto a 2 bedroom flat but DH felt it was fine to have his parents come to stay for 1 whole fucking month when DC2 was a week old
The in laws slept on the living room floor, it was a close thing, I had to convince DH I'd need to sleep in our bed (2nd CS)
Needless to say I wasn't in agreement with the length of time, 1 week would have been more than enough
They were v helpful especially my MIL but I just felt claustrophobic with 4 adults, toddler & newborn in a 2 bedroom flat
Also had v bad constipation so a trip to the loo took time, when I could finally get in there
All I wanted was to be with my new baby but I felt under pressure to let the in laws take over baby duty so I could go out and do other things eg see friends
But they didn't seem to understand I wanted the baby with me! DH put a lot of pressure on me too about this
In conclusion, you and DH need to be in agreement over any visit/duration or it will cause fall out & resentment
DC2 is now at infant school and this topic still gets me all stabby and I don't think I've ever felt the same way about DH since, I felt he didn't support me in what I wanted post birth
Enough of my whinging!
Please try to talk this through with your DH and come to some kinds of mutual agreement
Good luck with everything! 