Our stay at the AirBnB in Lisbon was terrible.
An told us that we can check in by ourselves and left us the key in the mailbox outside the apartment. We could open the door to the hallway of the house easily, but were immediately hit with a very strong smell of mold.
After climbing the stairs to our apartment, we weren't able to open the door to the AirBnB as the door and the door lock are broken and need immediate repair.
In the following days, we found a way to open the door accordingly, but during the seven days that we stayed at the AirBnB, no one stopped by to fix the broken door lock, although An had texted us that a friend of theirs would take care of the problem.
Shortly after entering the bathroom of the AirBnB, we discovered that mold can not only be found in the hallway but in the shower as well. In addition to that, we had to buy a new toilet brush for the bathroom after seeing that it was already well used and dirty.
We demanded from An that they pay for the new toilet brush, which they did.
The kitchen is a rather small space consisting of a sink, a fridge, a stove and a shelf that contains several kitchen supplies including two pots - one of the those too light to set on the stove which resulted in the use of only one pot.
The dishwashing detergent, the sponge, the rag and various cleaning supplies also seemed to be rather old.
The air conditioning only worked to a certain degree as well which is why we couldn't lower the temperature below 25 degrees.
Now onto the major problem of the apartment and the reason why we decided to rate the AirBnB this low. The blanket that we decided to use on our fourth day at the AirBnB is infested with fleas. The morning after using the blanket, we both woke up with a huge amount of flea bites all over our bodies. One of us was bitten in the face, resulting in pain and an infection of the previoulsy mentioned flea bites.
The bed, the floor and our luggage as well was infested at this point, leaving us in a situation where we knew that we needed to get out of the AirBnB as soon as possible. We asked An to refer us to another AirBnB of theirs but they couldn't do that because all of their apartments were booked at that time.
An told us that they would take a look at the situation, but they never came over and did not hire someone to get rid of the fleas as we asked them to. Rightfully so, we demanded a discount of fifty percent, as the flea infestation left us not only in physical pain but also in a great amount of worry, distress and panic.

We do not recommend you to stay at this AirBnB, as our stay there became a concern for our health. Even when we asked for action to be taken immediately, An did not handle the situation well, in fact, they didn't handle the situation at all.
Ending on a positive note, we did appreciate the location of the AirBnB because it was close to the city centre and public transport could be reached easily within the matter of around ten minutes.