Seamless versus instance interiors for small open world game?

Hey all. I'm facing a little bit of a quandary in my game design currently. I'm wondering if I should do instanced or seamless open world designed for the houses in my game. For example I'm creating a small farmhouse as the first thing that I make, just a simple cube with four walls and a roof. The question is, when you go inside does it clip the roof off of it and you see it top down, or do you actually fully get to go inside the home and it takes you to a completely separate level?

I have been musing on this a lot lately. The size of the homes is relatively small, like extremely small. The 3D equivalent of pokémon on the 3DS, I guess. It's not like there's a ton of stuff in there for the player to find and look through. So I'm like 70% seamless 30% instance. I think there are several cases where instance could actually be a really good idea but it would require quite a bit of work to make it meaningful to go through

The ideas that I have for instance houses being a pro are kind of interesting too. When you go inside, the interior is much larger than it looked like it would be on the outside. Or when you go inside, everything in there is an object that can be taken. But I don't know if I need that level of detail for my game or if it's just silly