We LOVED this apartment and the host Ana. We traveled abroad with our 15 month old son and they made everything incredibly easy from scheduling a car (with car seat) from the airport, loaning a stroller when ours was lost on the way, to having toys / high chair / everything we needed in the apartment.
With or without kids I would recommend this beautiful apartment with AC and wonderful and attentive hosts. It's in a perfect location in Chiado next to a grocery store, mall, and metro stop; also central to many of the sights in Lisboa.