Excellent place to stay when visiting Lisbon, everything is within a 20min - 25min walk when going into the city centre and the big squares or area's. The place is very relaxed and you have all the comfort you need, including a bath.
We stayed here with a baby, and Maria provided a baby cot, while the apartment had everything else as well what you would need. Like everywhere in Lisbon, there will be noise from the streets and neighbours, but nothing that disturbs your stay.
Definitely would recommend staying here, even with a baby and a stroller, just be aware of all the uphill battles when walking around :-)