We never met Francesca but she was really easy to get a hold of and the arrangement with getting the keys worked very well.
The apartment was amazing, really clean and cosy. It is located close to the metro and close to a lot of cafes, restaurant, second hand stores and it is walking distance to the flohmarkt im Mauerpark.
It only takes about 10-20 minutes to walk to the center of Mitte.
We didn't have any hot water but we knew this before we arrived and was compensated. Luckily it was some really hot days and it was kind of nice with the cold showers :)