Unfortunately my stay with Monica was cancelled the day of.
I told her about my arrival time (3pm) a few weeks prior and reconfirmed once I knew my train would arrive on time.
Monica didn’t reply to a question I sent 3 days prior to my arrival.
When I arrived at the address indicated in the listing, I didn’t know where to ring since she hadn’t told me her last name and was not able to reach her via the app or by calling. After waiting for close to 2h and calling about 8 times I contacted customer support who were very helpful. I had to book a hotel last minute (v pricey in Berlin) and Monica only got back to me pretty late in the evening, apparently her battery had died.
My experience was v bad and had me spend my first day in Berlin calling customer service and hotels, but maybe it was just bad luck. The location is great though and maybe others have more luck