The apartment was exactly what I was looking for: nothing too fancy, but everything I needed, and at a great price.
Although the host was not in town during my stay, he was always easy to reach. When a random plumbing problem required a service call from the utility company, the host quickly took care of things and even refunded two days from the reservation for the inconvenience.
The host arranged for an associate to greet me upon my arrival and let me into the apartment. The associate went above and beyond the call of duty, performing this service three more times as I repeatedly locked myself out during my month-long stay. Thankfully he lives nearby.
The apartment itself was immaculate with every provision one might need. It's a ground floor apartment (well, there are a couple of steps at the building's entryway) with a balcony (almost like a porch since it is a ground floor apartment.)
The neighborhood is quiet. A small grocery store is right around the corner. There are two U-Bahn stations a couple of blocks away, and KaDeWe, Berlin's high-end shopping mecca, is only a few steps farther.
All in all, it's a solid choice at a reasonable price.