We (family group of 9) enjoyed our stay a lot. The house was perfect for our group: we had five bedrooms, three bathrooms (one on each floor) a living (which we hardly used) and a large enough for nine, well equiped kitchen.
The house is close to the confluence of the Spree and Havel rivers. A few steps away you’ll find a playground and a terrace overlooking the rivers. At walking distance you can find boats that can take you to the city or the other way, to the Wannsee.
The city centre (of Spandau) is close by. Bakeries, supermarkets, U-bahn and S-bahn are all within a few minutes walking distance. With S-bahn from Spandau Rathaus you can reach all the main stations without changing trains. (App 25 minutes to Hauptbahnhof)
If you are looking for a house for nine and you don’t necessarily need to stay in Berlin, this is a very good option. Spandau is not a particularly attractive place - the Altstadt is not what you might expect of it. But if I were looking for a convenient place to stay for a large group and a reasonable price within half an hour from Berlin city centre, I would certainly book this accommodation again.