The apartment is well appointed, partly because someone seems to normally live in the space when it is not rented. Oddly, there was no microwave. The space is modern and generally clean. The location is very convenient, central, close to retail and to public transportation. Berlin was about to experience a heat wave and there is no A/C or even the fan as listed in the description. Other reviewers mentioned this also.
The host has very specific requirements for check in and charges for an arrival more than one hour late or an arrival after 6 pm. This concerned us, especially with the frequent delays of the German train system.
The elevator in the building has been broken for quite a while and will not be repaired any time soon. The place is on the 4th floor, so quite a climb especially with luggage. The host did not inform us of the broken elevator until the day of arrival. The late notification was apparently timed to avoid a cancellation by the guest. The climb would be very difficult or even impossible for people with limited mobility. When booking this apartment you may want to inquire first about the elevator.