We had an excellent time at Betty's place.
The location in Berlin is perfect. Nice area, lovely bars, big market on friday. The subwaystop is just around the corner, so you are everywhere in no time.
the appartment is big and cosy and you can have a coffee in the late morning.
you can hear noice or music from the shop (during openinghours). But that didn't distrub us at all!
we had the feeling that there was always some one there to go to with questions. We felt very welcome.