Diana's appartment is a great place to stay in Berlin.
It is very close to the city center, within walking distance from main attractions. There are two underground stations nearby but I almost never had to take public transport. The neighborhood is quiet and safe at night, no problem at all.
The house itself is well nice, ideal for a solo travelers or a couple. Everything was as shown in the pictures, nice bed, hot water, wifi etc. Cleanliness could possibly be improved a bit, but it was not an issue.
Finally, Diana is a really cool person! She was understanding with a change in the reservation that I had to make. Communication was always great with quick responses, check in and check out were both really smooth.
Thank you Diana and hope to be back!