The apartment was really great, clean and stylish. It's close to transport in to the city (which is lucky because there isn't really anything to do near the apartment) and is really close to hauptbahnhof for getting in and out of the city.
The kitchen is stocked with every imaginable cooking utensil (I managed to cook an entire Sunday roast for Christmas there!) and my girlfriend got a lot of use out of the coffee machine. The host charges 70cents for the Nespresso coffee capsules but this is reasonable as they are expensive to buy. The only thing we would change is that the Freezer was full of someone elses food, so food we bought to put in the freezer didn't fit in and we had to let it spoil - it would be nice if the fridge / freezer was empty. :)
There is a shop across from the apartment, but we would recommend the REWE store a 10 minute walk south, as the shop nearby is very expensive (though it is convenient).
I would definitely stay there again if I visit Berlin in the future.