The location is close to the tram (5-10 min walk), but the apartment and to the unit itself is absolute pitch dark so it is extremely scary at night to enter the unit. Also, Christian asked us to leave 30 euros in cash for cleaning fee, which was not included at the airbnb fee that I paid so this is extra. But we found huge spider web in the bathroom, and dishes were dirty with stains to use. We received very few towels, and wifi is extremely unstable after midnight. Warm water only runs for a while, so next person would need to wait after one person finishes the shower. Also, there were much noises, which I assume it is because the unit is at the rooftop. I have no idea but it was quite consistent.
On a positive note, the unit was very stylish. Good sunlight. Christian was fast at responding, but it was less than I expected.