Eric is a very friendly and hospitable host, who did everything to make us feel welcome. His flat was exactly as described, and was clean and very cozy. The location of the flat itself was quite central, being next to the U-bahn and near many shops, bars and restaurants, though the neighbourhood did feel a little rough at night.
All in all, it is a great place to stay if you are planning to stay in Berlin for some time, and I would very much recommend it.