We met Tom only and he was happy to store our bags before we were meant to officially check in. He was very helpful and welcoming and spoke perfect english.
The apartment is bigger in person than it is in the pictures and is indeed very clean and light, the kitchen is excellently stocked with utensils etc.
The beds were comfortable and there was even a collection of books and a stereo for entertainments as well as the TV.
Overall this is an excellent and conveniently located place to stay for the price of little more than a youth hostel.
Next time I visit Berlin I will definitely be back !