Lifestyle choices like going out to eat a lot or spending a lot of time out of the house for work or hobbies also change what one may need in a tiny house. However, with some thought, I've been able to determine a few difficult things that I think would be difficult in any tiny space. I've broken it up into the hardest thing about living tiny overall, living tiny alone, with a partner, and with a family.
1. The hardest part about living tiny is not easily being able to have people over to your home. Some people don't care about this, but it's something that I value more now that I can't do it. Yes, you can have 2-3 people over for dinner. Yes, you can have people over for a bonfire and spend most of your time. But sometimes, I just want to have 8 people over to play cards in December. And I can't do that in my house.
2. The hardest part about living tiny while living alone is not being able to move/exercise inside. Yes, you can get a gym membership or go outside, but I like to exercise inside my own house. I can try to do some light body weight exercises, but it's just narrow enough to make it annoying.
3. The hardest part about living tiny with a partner is being tidy. In a small space, messes can quickly go from "harmless clutter" to making your home completely dysfunctional. Dealing with someone else's mess making it impossible for you to brush your teeth- that's a recipe for an argument. Alex and I both have to be so respectful of each other's space and belongings.
4. The hardest part about living tiny with a baby is being quiet while he sleeps. He can handle some noise, but sometimes things do wake him up. More than that, we're always super conscious about how much noise we are making. He naps 2-3x a day and sleeps 10-12 hours a night, which is awesome and good for him, but that's a lot of time to be quiet.
All of that said, I know that this is just a season. Baby won't nap forever, and we will still have the tiny house.