This is my first negative review, after having travelled many times with AirBnB and also having been to Portugal many times, always with positive experiences.
In a nutshell: I had to spend a whole day without heater in the room, since the installed one wasn‘t working. With the insulation of a Southern country this means that you are in for a cold night and a very cool day. I slept underneath several blankets and with a water bottle. But had to work from the bed after the first night, since the desk was simply to cold.
On top of that, the main door to the shared apartment was open and impossible to close at some point, so anyone could just have wandered inside. Not a safe situation (although Portugal itself is a super safe country).
I was in regular exchange with the host via chat and also called their hotline several times. The problem was only fixed on the evening of the second day by bringing a portable heater. Before, the very unspecified answer was that someone would come but that it would not be possible to arrange a definite time with them. For a professional, business-like host who claims 24/7 service, this is unacceptable. When I asked for a refund for the first night, I was sent a reimbursement of 8 EUR. I asked for the whole night and the answer was basically „Sorry, take it up with AirBNB“. Their mediation center spoke with the host, also to no avail. Kudos to AirBNB for reimbursing the rest. But I will definitely not become a repeat customer of the host. I would hope they optimize their logistics, because everyone on the phone was very nice.