First with the positives. The apartment is in a wonderful location, right next to the metro in right in the city center. It's a very nice apartment, and the host was friendly. They also provide earplugs for people who have trouble sleeping in noisy area (keep in mind it's city center and there is a lot of traffic). But the noise didn't bother me at all. The entire building is nice.
Now with the negatives. The communication was awful. Week before our stay I massaged the host with request we arrive a bit early than at the check in time. I had to wait few days before I got the answer. He said we could arrive early. Once we arrived at agreed time, I massaged him again but got no answer for few hours. We had to go see some attraction with all the backpacks and luggage with us. Later he responded with an apology. We completely understand that life sometimes gets busy, but if you are running AriBnb you should be available at agreed time.
Also, maybe this is standard practise, but we had to additionally pay the host 52€ of tax for 6 people on 2 night stay.
But, otherwise the host wise nice and the stay was lovely. Even with all the problems, I would probably stay again and would recommend the apartment to others.