The location of the apartment is great. Bairro Alto is a great area in Lisbon: a lot of bars/clubs opened all week days, great restaurants, coffee shops and the whole area looks just amazing. The apartment is very clean, looks exactly like in pictures and is good enough for 3/4 persons.
Nuno is the best host I ever met on Airbnb. He is so nice, gave me great recommendations and advice me, helped me with everything I needed; in the last day he even gave me and my friend a ride to the bus station and helped us with the luggage. I really recommend you to pick Nuno as your host, even if this apartment is not the best option for you; he has many apartments available in Lisbon.