Staying at Olaf's place is such a pleasure if you want to explore Berlin and also the amazing lakes, rivers, canals and forests surrounding the city. Olaf leant me his bike and a local map so I could explore the Müggelsee, which was so beautiful, and a great place to swim. Also just down from their place, on the riverside behind Netto supermarket, there is a great spot to swim too!
There's a small kitchen so you're really able to make meals and relax at home. Getting into the city to see friends was easy as the Grunau S Bahn stop is really close, 20 mins by walk, or 5 min by bike. Olaf and his wife were friendly and welcoming, as were the other tenants staying there.
See a different side of the city at Olaf's place - a peaceful side surrounded by water!