First of, it's a "professional" Airbnb not someones "cosy home", if this is what you are looking for it's perfect place to stay.
Checkin worked flawlessly and the next day Sven checkd in, via message, to make sure everything was allright. Other than that we had no contact with anyone - Not that it was necessary, as everything was taken care of. Checkout was letting the keys inside and closing the door behind us. Can't get much faster than that.
The place itself is at a good location close to center, transport nearby and electric scooters right in front of the door (as everywhere around berlin center these days).
It's pretty modern, but almost spartan (mostly ikea style), furnished and equiped with everything needed for a usual stay. And for everything else a shop is nearby.