There were 4 adults and a baby travelling, and the apartment was great for us.
Location: Good location, just off Av. da Liberdade. It is about 15/20 minutes walk to the main tourist areas (as a point of reference, I am referring to Elevador de Santa Justa). The apartment is in a nice location, away from the tourist buzz but can be part of the buzz with a 5 minute walk. The apartment is on a steep road (as expected in Lisbon), so be prepared - pushing a buggy up was definitely a work out for my legs.
Apartment: Fantastic, modern and comfortable place. I really cannot fault anything with the look of the apartment. The building is very modern (and secure - there was a security guard who manned the front desk on weekdays, I think). The bathrooms were in excellent condition, the kitchen was stylish with branded appliances and plenty of kitchen utensils. The two bedrooms were spacious with plenty of storage. The main living area was also spacious and bright.
Garage/Parking space: Underground parking on site, clean car park and the car parking space was reasonable.
Hosts: Friendly and responsive. We were given travel tips on arrival, and they provided us with a high chair and cot free of charge - which was a nice gesture.
I would definitely recommend this apartment.