Nuno's apartment was outstanding. The pictures are very accurate and everything was spotless. It is very quiet. The only noise was occasional construction work nearby but it never went on for more than a few minutes at a time. There is no traffic noise at all - it is a narrow alley behind the apartment.
Nuno met us promptly outside the apartment and gave us a very helpful, detailed orientation.
The kitchen is well equipped and the pots and pans are very good quality. The television is well set up with cable channels as well as access to Netflix (if you have an account) and other apps. The bed is queen size and very comfortable. We kept the windows closed and used the cooling system. There are two units in the apartment and they work well. I suspect that this apartment would be cool and comfortable in the summer too. There is also a folding bed in the living room that would be quite comfortable if needed.
The location is excellent, right in the heart of Lisbon next to the main cathedral. There are two entrances to the unit - the "back door" opens onto a quaint alley leading to the cathedral, and the front door which is down the elevator and onto a bustling street with lots of restaurants. It is close to transportation. We only used taxis (of which there are plenty) and Uber. Transportation is very cheap in Lisbon so it was easy to hop in a taxi even for a short ride to the market.
There are lots of great restaurants and Fado bars nearby. Nuno gave us a map and a list of places to try. We really enjoyed Maria Catita just down the street for great food and service. Portela café was great of coffee and pastries. The restaurants behind the apartment near the cathedral were not as good, mostly tapas that didn't look very appealing. Esperanca da Se was good for pizza and pasta. We also did take out pizza from the restaurant just outside the main apartment entrance - Bello Forno. It was very good.
I have no hesitation in recommending Nuno's place. It was one of the better AirBnBs we have stayed in.