Very. Loud. Noise. At night.
Traffic noise is loud, but more or less fine. But also there's a club or a bar next door, starting at midnight. The music was so loud, that I could hear it even through my earplugs. Music was there every night, not only on weekend. When I asked the host about it, he answered that they can do nothing with it.
The apartment itself is nice and clean, even though we had to buy all the goods of first need, like oil, salt and sugar. Also hosts kindly allowed us to keep our luggage after checking out and answered all the questions immediately.