We loved the location of the apartment, which was particularly good for vegans. There is a biomarket and a range of vegan places to eat close by (5 minute walk). We had great burgers at Lia's Kitchen and curries at Khushi on Kollwitzstraße and there are vegan donuts 10 minutes away.
It was easy to walk to the centre and also convenient for the U-bahn. Later in the week we bought some 48hr Berlin Welcome Cards, which were good value for traveling to other parts of Berlin and going to museums.
The apartment was very comfortable and peaceful and the terrace has a good view over East Berlin. We had a lovely welcome from Marein, despite arriving late due to a delayed train. Taxis from Berlin Hauptbahnhof are good value at less than 12 euros.
We started our visit to Berlin with a free walking tour https://originalberlintours.com/tours/free-original-berlin-walking-tour/ which began a 14 minute walk away from the apartment and was excellent. Our guide, Francisco, was very knowledgeable and enthusiastic.
Overall, we would highly recommend the apartment as a place for exploring Berlin.