This was the single worst hotel experience I've ever encountered. Since we were in Mexico I was careful to choose a hotel that stated there was English speaking staff, there was not. The room itself was stuffy and had an almost stale towel smell. We opened the windows and turned the fan on the highest setting to air it out. The plumbing to the bathroom sink leaked onto the floor. The shower barely dribbled any water out. We had to keep refilling our water bottle in the sink and pouring it on ourself to wash our hair and body off. One of the bathroom lights did not work and the mirror had rust around it. The towels were old, frayed, and rough. The comforter on the bed was worn thin in areas and had frayed seams. 
The pool was not kept clean and although it was very hot we absolutely did not want to swim in it. The door to our room was not even sealed, you could see into the hallway. And so you could also hear everyone outside of the room as well. But then! The worst thing of all happened! Some complete stranger swiped a room card to our room, opened the door, and walked right in. While we were in bed! All he said was, "Oh sorry, guess they gave me the wrong room card." Seriously?! We ended up moving furniture to barricade the door shut the rest of the night. But regardless, neither of us were able to sleep. At one point we even considered checking out and just paying for another room somewhere else. It was horrible!