We didn't hear about key pick up from Marcus until mid morning the day we were due to arrive. We had sent several messages including contacting airbnb so started to research emergency hotel options! Once we arrived, communication was very prompt.
The apartment only had bedding and towels for one person - Marcus did bring more the next day when asked.
Once the issues were sorted, the apartment was a lovely base for exploring the city. It is in a great area with lots of restaurants nearby. You can walk to Museum Island and there is a metro stop close by.