Loved my stay here barring a few minor issues that were dealt with swiftly by the owner, Altido. Great location, Rua Sao Bento is right across from the magnificent Portuguese Assembly. It is located wonderfully, and within walking distance of the old parts of town like Bairo Alto, Chiado, Baixa, Alfama etc, where you will be spending most of your time, when you visit this most beautiful and charming city.
The Altido folks were extremely responsive to my emails if I had any issue. The bed is firm and wonderful to sleep on. The apartment is quiet at night, and the kitchen is well equipped. It has a nice terrace to sit outside and chill. If you plan to use Uber a lot, it is quite inexpensive in Lisbon, and they show up promptly at the apartment. But I suggest walking everywhere, it is more fun and you can see and experience a lot more.
Behind the apartment is a wonderful square with some nice restaurants, including Cafeh Tehran, which I strongly recommend for Iranian food. There is also a wonderful gelato place called Nannarella's, just around the corner from the apartment.
Enjoy this place and your stay in Lisbon!