We booked this apartment due to its location in Lisbon. It is in a great location, close to many sights, restaurants and shops. The apartment, like many in cities is small but it is well represented in the photos. Our issue with this apartment was on our second to last day we were woken up by the sound of running water. When we got out of bed to investigate we found that water was pouring out of the ceiling lights in the bathroom. There was so much water coming through the ceiling that it had pooled on the bathroom floor and had run out into the hall and across the kitchen floor. We grabbed all of the available towels to try to stop the flow of water from getting worse. While doing this the water continued to pour through the ceiling. We grabbed whatever was close to try to catch the water as it fell and found a glass pitcher in the kitchen. Holding the pitcher up and catching the water we began to see the color of the water and also noticed the smell. This was not water from a supply line, this was waste water. The water in the pitcher looked like urine and smelled terrible. This water problem lasted for close to an hour until it abated. By this time my wife and I were covered in this filth trying to manage it. We repeatedly called, messaged and emailed the Host and she did not seem to grasp the gravity of the situation. She also denied that this had ever happened before but despite not being at the apartment was quick to inform us that it was due to the upstairs unit's guests (another Airbnb of the Host) overflowing their shower. We had gallons of waste water come through the ceiling, this was no small trickle or leak. Needless to say, the stay here was ruined as was all of our personal belongings that were in the bathroom and had to be thrown out. It was a disgustingly gross mess dealing with other people's filthy waste water. In discussions with the Host we came to an agreement to leave the apartment early and receive a refund. Relying on this promise we moved out and had to find a new place on short notice at a much higher cost only to find out a number of days later that the agreement was not being kept by the Host. Needless to say we were very disappointed with how this was handled. We understand that things happen and sometimes what happens is out of the control of the Host but the reaction to this situation was completely within the Host's control. With the amount of waste water that poured into this apartment it needs to be checked out and properly addressed to avoid mold growth and a proper cleaning as well as a fix to avoid this from happening again. It did not appear that any of this was going to be done by the Host from our conversations. Were it not for this incident, this would have been a very different review.