In all honesty, staying at Sergio's apartment was the worst experience we've had on Airbnb. The hygienic conditions were deplorable (nothing to do with how it was indicated in the ad): we found dirt on the floor, carpets and chair cushions full of stains, stains on all the walls of the apartment, even mold on the sheets!
As soon as we arrived, we realized that the building is right under the airplane route that goes directly to the airport, so if you don't want airplanes passing by with a thunderous noise every 10 minutes, don't choose Sergio's apartment (he didn't mention it at any time in the ad).
But worst of all, we had a water leak in the kitchen sink and right underneath was a large container to collect the water that filled up every time we did the dishes (it was obvious that it was placed there on purpose) but at no time were we told that it could happen if we did the dishes by hand.
This is unacceptable by airbnb standards and even more so for someone booking your apartment for 9 nights.
It was very disappointing both the experience and Sergio's solution of bringing in a plumber to fix it. When you have been saving up for a vacation and book an apartment on airbnb the last thing you want to do is to have to wait for a plumber to fix someone else's water leak and waste your time.