The apartment is beautiful and very clean, the bathroom is wonderful and the kitchen too, we were very pleased with everything in it. We enjoyed the tall windows that gave a lot of light and the fast wifi. The location, of course, was very good.
The hosts were nice (although we only met Wendy, she was lovely), the communication was good, although one question I had asked was left unanswered until we reached the flat (and could see the answer on our own). Other than that they were very helpful.
The insulation isn't the best. People slamming doors and walking around sounded like they were inside our apartment. Also in the night people leaving bars were very loud and I slept very poorly, despite the fact that the bed was very comfortable. But I guess that's the price for living in the center. :)