We booked this apartment twice for the same trip.
This is a well located studio in the heart of Lisbon, walkable to many of the main sights, as well as the metro station (Baixa-Chiado is literally a short walk away, and so is Rossio, even the beginning of the Tram 28 at Martim Moniz isn't far away). The bed was spacious.
We were here in early October, but we still hit a few days of heat. There is a portable fan available, but no other air conditioning. It worked fine for us. In the evening you can open the windows to the outside and you'll get a breeze and it's comfortable.
Maria's instructions for check in is easy to follow, and she provided the basics that we need for a comfortable stay.