My husband and I stayed his in April for the few days we were in Lisbon. I attempted contacting the host to confirm the address a few days prior to our trip since we never received so much as a confirmation email from him like all our other AirBnBs. I ended up calling him when we were in Lisbon airport. To save you some grief, the address is correct, and those other reviewers who said it was wrong are outdated. The place is in a good location, but know your Uber driver will be most likely be unable to go in to the neighborhood so best pickup points are larger streets requiring an uphill or downhill walk. As an added bonus David's parents' shop, which is like a convenience store and bakery, are right next door and his parents are so nice, which makes it difficult to write this review.
The apartment is on the second floor and there is not an elevator, but that is expected in Europe. The space has basic necessities but is smaller than the pictures portray. It was difficult to walk in the bedroom without stubbing our toes due to a set of drawers in the corner. I can't comment on the kitchen since all we used was the refrigerator and glasses. The restroom is spacious, IMO, but the water pressure is poor and it was difficult to get the water hot even after waiting several minutes. We took warm-coldish showers. It's difficult to explain.
The stairway smells like rotting wood, but is in good repair. We spent most of our nights there feeling very cold and ended up getting some sinus infections as well. The heater in the place was difficult to operate due to a broken knob. When I asked his dad how to operate it, he kind of just smiled and maybe said it wasn't needed, I'm not really sure. But the question wasn't answered.
For 3 days the place did the job of providing safety and shelter. However, I may splurge a little more if I'm ever in Lisbon for some of the other amenities my husband and I are used to.