This large, thoughtfully-furnished and comfortable apartment was perfect for our 1-week stay in Lisbon. The communication with the owners was excellent, and we were personally welcomed at the apartment and oriented, with numerous suggestions about places to visit and eat in the area and elsewhere in Lisbon. A nice bottle of red wine was provided. We received periodic messages from them checking to see if things were ok and offering additional ideas about things to do. They even contacted us on the day we checked out to see if we needed them to hold our bags for the day.
The mattress is firm; we found it very comfortable and slept great, but those accustomed to memory foam might find it too firm for their liking. Kitchen is well furnished with utensils and dishware, but could use a couple more pots and pans. Coffee, tea, spices, oil and vinegar are provided. We received a nice bottle of wine on arrival. The dishwasher racks were missing some wheels and the utensil basket had holes in the bottom; one stove burner didn't work. Everything else worked well and the apartment seems generally well maintained.
The location is 2 blocks from the Martim Moniz Metro and close to several tram and bus stops, so it's easy to get where you want to go. The area is not as heavily touristed as Alfama, Chiado, etc, and has a lot of ethnic character (largely African and South Asian). This was fine for us, but those who want to be in a main tourist area may be uncomfortable (we never felt unsafe). Street litter was pretty heavy, too, but we did not see any homeless, which we certainly did in other, more trendy areas of Lisbon. The streets are noisy during the day, and conversations and passing vehicles are easily heard even with the windows closed, but things do quiet down considerably at night, as there's little in the way of night life on the street. That said, if a truck goes by at 2 am or someone passing on the street is having a conversation, you are going to hear it, as the street is narrow and reverberant.
For those with mobility issues, be aware it's a steep climb on narrow cobbled streets from the Metro, and one flight up narrow stairs to the apartment with no lift option. (This is pretty typical for Lisbon.) Also, the bathroom tub lip is very high, and one of us who had had hip replacement couldn't get in or out of it; no problem as long as you're flexible.
Overall, we were happy with our stay and would return in the future.