Sonia's apartment is absolutely beautiful!! We had a fantastic 4 night stay here, it was perfect for our trip in Berlin. The bed is very comfy, the shower is great and there's always hot water, we didn't cook anything but if you need to the kitchen is fully equipped and the place is furnished beautifully. Prenzlauer Berg is a very quiet area compared to some other parts of Berlin and you have to use quite a bit of public transport to get to the big clubs (there aren't many clubs/bars in this area) but we didn't have an issue with that. It's a stunning neighbourhood where most prewar architecture survives compared to everywhere else and there are lots of good restaurants and cafés within walking distance. Tram stop is right at the top of the street and Alexanderplatz is close nearby.
We didn't meet Sonia personally but her friend Nadine met us in the apartment to give us the keys. Sonia was always on hand to see if everything was ok with us, always immediate response, she's a great host and i would recommend this apartment to anyone! It wasn't a problem for us but there were a lot of stairs and no elevator so for the less able this might not be as great a place to stay.

I definitely recommend this beautiful apartment! Hope to return some day. Thank you Sonia :)