With 4 girls from Holland we had a great time in Charlottenburg. The appartment was nice and cosy and there was fresh fruit, chocolate and drinks available upon arrival. We were a little early, but Jennifer (or in our case her dat) did her best to meet us immediately. We did not use the bikes, the ride to the centre was a little too long. If you prefer doing all your sightseeing in Berlin by bike, I recommend sleeping in an area closer to 'Mitte', even though the U- and S-bahn network is great. Compared to hipster-areas like Neukölln, Kreuzberg and Friedrichshain, I think Charlottenburg is a little less cosy. Nevertheless we had a great time!