Cristina's apartment is an ideal base for a visit to Berlin. The apartment is well furnished and maintained, and was spotlessly clean and tidy. The balcony was a real bonus. We met Cristina's partner, Alexander, who was most helpful and welcoming.
The location couldn't be better, in that it is on Hackescher Markt, a bustling piazza with an abundance of restaurants and bars, close to the universities and museums/galleries. The nearby station gives direct access to Brandenburg Airport (via the S9 train) as well as fast access to other parts of the city. The apartment itself is on the sixth floor, accessible via a lift, and the double glazed windows keep out most of the background sounds.
We shall definitely be returning again soon.