We've had a great stay in the apartment! It is quite good and definitely enough for two people, with fully equiped kitchen and bathroom. The location is excellent in the heart of the Born district with many great restaurants and cafes just around the corner. Despite being in the city center the apartment was quiet and it was easy to fall asleep. The apartment had good wifi and TV available which provided entertainment on the evenings we decided to stay in. On the first day we arrived at 1 PM so before the check-in time, when I called the office they told me the apartment wasn't ready yet, but they called me back around 20 minutes later and we were able to check-in over hour earlier which was very useful as walking around the city with suitcases isn't the most comfortable. The staff was very helpful and responded to all the questions very quickly on Airbnb and answered the phone calls. On the last day we were also able to leave the luggage in the office after check out and go to enjoy the city for the last time without worrying about finding an affordable luggage storage.
I definitely recommend this apartment for two people for a short stay as well as a longer one!