This location is very safe. I guess it is a higher residential or commercial area. As all car dealers are there (BMW, Audi, Pugerut, etc.). The location is very close to the metro station which is on the same line from the airport. There are some nice restaurants and also a lot of affordable eating places too. I highly recommend this area rather than the old Lisbon area such as Alfama or Chiado. Cos you don't have the slopes. Saldanha is flat, big wide roads.
Filipe has well prepared the apartment for us, very clean and comfortable. It is also very spacious for two of us.