Arnd place have a really good location, near to the central station, is easy to get from the airport. Also is near to the main spots to visit in Berlin, so you can visit by foot or bike.
The only thing that make us feel unconfortable is that the water heater is in inside of the room and that is a little unsafe for us (use gas).
But if that is not a problem for you, this is a great place to stay and enjoy the city.
Everything else was really good, super clean and confortable.