Overall, we felt that this apartment was a good value and we enjoyed our stay. Check-in and out was very easy, the bed was comfortable and an actual double bed (rather than two twin mattresses put together), the location felt safe and was very close to multiple train stations and cafes and at least one grocery store, the apartment was very cute, the views from the rooftop and balcony (both of which has tables and chairs) were lovely, and the internet was reliable.
However, we did have issues with the noise level and cigarette smoke here. Typically, German apartments do not have air conditioning, so you'll need to open the windows for air flow and cooling. This creates problems with noise and cigarette smoke from the restaurant and bar across the street. Expect people to be outside chatting and smoking even on weekdays until the wee morning hours. Even with the windows closed, it's a bit disruptive. At bare minimum, bring ear plugs. You might also bring or request a fan and/or white noise machine. Additionally, we noticed that the bed linens and the main rooms smelled nice and fresh with the windows closed, but the bathroom, bath linens and washing machine did smell like smoke.