Antonio's place is really convenient to the shopping and city center. Also, very close and within a short walking distance to the Castelo de Sao Jorge. Great for a couple but no more than two people. Being a woman traveling on my own, I felt very safe and comfortable staying here. There's a little market right behind the apartment and they were REALLY nice about letting me use my credit card the first night I arrived...it was raining very hard and I had no euros at that time. They were also helpful in giving the airport transport service the exact location of where to pick me up when I was leaving Lisbon. Location for UBER or Taxi is a little tricky I guess, but it all worked out.
Antonio also provides a nice bottle of wine and I was able to relax at night with a glass of that and watch a movie in English. Very comfy!
Had a great time and proved to myself (and my family) that I could travel on my own!