We highly recommend this space!
To echo everyone else, it's extremely private. We did have a few questions so I'll try to answer them here:
It's a very large space, basically a studio apartment, and it does have a private door. It's not quite underground, but it is partially subterranean which keeps the climate nice and makes everything very sound proof.
When you walk into the front door, there are open stairs immediately to the left to go up to the kitchen/living room, which you are welcome to access.
Otherwise, past the stairs is your private door which leads to a landing with a washer/dryer and sink area. Then there are the stairs which loop down and around, then on your first left is a door for a large walk-in closet which has a coffee bar, fridge/freezer, and microwave. Second door is to the bathroom, and beyond is a large open room with everything you could need.
The nature of the stairs and space means it's EXTREMELY out of the way and you truly have your own space.
We never heard any disturbances above us, and I would hope we didn't disturb them either. We stayed just two of us and shared the space for a full week, with both of us working from home during the day.
The amenities were extremely thoughtful, the whole house was BEAUTIFUL, and our private studio was everything we needed. We absolutely loved our stay and hope that answers anyone's questions about how the space is shared/laid out!