The key handover was efficient (despite us being late). The apartment is spacious and just what we needed with two small boys: two large bedrooms with a dining table in one. The beds are comfortable, the blinds make sure that all light and sound is blocked out, the apartment is at groud level and public transport is everywhere at a five minute walk.
The rooms were clean, the kitchen is lovely (all built in equipment is Miele) and the shower is great. Additionally Neuköln is really good if you love food: there are so many choices of good take out/dine in restaurant of every cuisine one could imagine + very affordable.
In all we loved staying at Sören's apartment!