The good: the location of this property is very central and is a close walk to S. Georges Castle, walkable to the main square and train station and only steps away from metro (which transfers from the airport). The hosts were very fast to respond to all of our requests and needs and they accommodated us with a baby. The building is also very safe feeling with sturdy doors off the street.
The not as good: This particular apartment is very small. As a family of three, we found it impossible to be organized at all inside and it was very cramped. The kitchen is nice but there is no workable space or anywhere to store any groceries etc (except for the fridge). Although there are windows that open into the shared courtyard and the glass is privacy tinted, the only way to get air is to open the place up to the other residents.
Overall this is a decent place if you know what to expect. It is good to stay for a couple of days and be well connected in Lisbon but if you are staying longer it may feel too cramped. The hosts were wonderful and attentive and it is clear they make every effort for a positive experience.