Ayako is a lovely and nice host. Her apartment is just along the main street and very easy to find. There are plenty of free parking during the weekend. On weekdays you need to pay.
The room is tiny but is more than enough for me.
Location is ok. 7 mins walk to the nearest train or 5 mins to the bus stop going to Berlin center.
With the price i paid, it's definitely a very good place to stay in Berlin!