Karsten was really such a fantastic host. His detailed instructions were very easy to follow. Upon our arrival he showed us everything we needed to know about his beautiful light-filled flat. He gave us many recommendations that were very close by in Mitte & also how easy it was to take the U to get around in Berlin (there's a stop right down the street - highly recommend the day pass for 7 euros). We did plenty of walking as well as the neighborhood is just lovely to see. Plenty of cafes & restaurants nearby. We were within walking distance of the Berlin Wall Memorial & Museum of Natural History as well as some beautiful art galleries. There was a lot of construction on the main street just west of the flat - but you couldn't hear it at all. It's a very nice & quiet street. Since we were there in November - it was really quite chilly out - but his flat was very nice & warm to come back to. Communications prior to our arrival was fantastic. We didn't need to bother him with anything while we were there. Perfect for a couple or a pair of friends who enjoy traveling together. Would certainly love to come back & stay again.