Stunning, spotless apartment -- exactly as conveyed in the photographs. Light, airy, spacious, and very conveniently located on a lovely street. A short walk to the M4, M10 and M2.
Check in and check out was very easy. Dan and Robert were very quick to respond to my initial query and reached out to me to make sure that check in and check out to accommodate my travel schedule. Very gracious, responsive hosts.
Also, I very much appreciate that Dan and Robert have registered their apartment with the city in keeping with recent Berlin legislation that is trying to combat the negative impact that Airbnb can have on residential neighborhoods when non-resident, "professional landlords" transform large numbers of rental apartments into de-facto hotels. To be clear, this means that Dan and Robert are renting a (lovely) primary residence, not operating an illegal hotel.
(cf https://www.citylab.com/life/2018/03/berlin-airbnb-vacation-rental-regulation-law/556397/ )