Maria João and her family are lovely, kind people, which is why it pains me so to report that these accommodations are substandard, perhaps half a step above a backpackers youth hostel.
The unit has a moisture/mildew problem, which they try to ameliorate with a large dehumidifier in the living that goes off intermittently with a loud roar day and night. It made me sick for the first three days until we could dry up and kill the odor. Despite a good breeze outside and all the windows open, the rooms remain oddly stuffy, muggy, and airless. The two rickety fans we requested did little to help.
The master double bed feels like cardboard, which they tried to improve with a squishy queen foam topper too big for the bed. So it's like sleeping on a hot marshmallow, except you slide off the edges (a nightime fall which bruised my wife). I slept alone for a month on the futon sofa, which was broken and did not fold flat (they tried unsuccessfully to fix). We did not use the bunk beds but the mattresses seem like plastic.
The "garden" is a gravel pit of sharp stones, unsafe for children and finished with cheap plastic furniture with peeling paint. It is unhospitable. The kitchen has the bare minimum (1 small pan, 1 small pot, etc) and is unsuitable for any kind of cooking beyond pasta. The fridge pools water inside. The oven doesn't stay lit. The sink backs up and needs constantly plunging. You get the picture.
The toilet sticks and runs.
We tried to leave the first day but the booking was nonrefundable and AirBNB was a Kafkaesque nightmare of customer service neglect. Their response to the mildew smell pervading the house was "can you take a picture?" Believing nothing we reported and inciting the place was exactly as represented, they finally negotiated a small partial refund but provided no help relocating us, which would have left us homeless for the month. It was a disaster, and will likely be our last dealings with this platform (and we are 5-star guests with 25 years of home exchanging behind us, as well).
We wish MJ and her family all the best, but in short, I'm sorry to say that this extremely small storage room conversion unit needs a lot of work to accommodate all but the least demanding of travelers. It was a very unpleasant place to spend our time in beautiful Portugal.