I have also previously stayed in this apartment, which says everything really. It's just as good now as it was then - really pleasant area with plenty of cafes, bars and restaurants nearby. Also, very family friendly with a number of parks within walking distance (even for my 3 year old!). A number of bus, S-bahn, U-bahn and tram stops are also in the surrounding streets, allowing you to get anywhere in the city quickly.
Easy to contact Torsten and also Elva who looks after the apartment for him. Would be very happy to visit again.