Nelson has been a great host and of a great help for me and my girlfriend in our 4 days trip in Lisbon.
The location is nicely balanced - both close to the old city centre but in the same time not too close to the crowded streets, thus you can sleep really well. There are coffee shops and restaurants very close to the apartment.
The apartment is neatly decorated and you'll find everything you need inside.
I would highly recommend Nelson as a host and the apartment if you travel to Lisbon and need accommodation.