Overall the apartment is remediable for a short stay.
It is well located, in the Belém / Ajuda area, with easy access to the Tagus riverside area. There are several services in the places, namely, a well supplied supermarket (Pingo Doce).
There are several nice amenities included, the one note mentioned is the modern kitchen equipment.
On the downside there are some aspects that need to be stated for future guests intending to travel in the same conditions as ourselves (long stay during the summer):
1) Temperature and Humidity: During the hot season in Portugal, the apartment is tremendously hot and unventilated (there is not a fixed air conditioning unit, only a small fan). The facade is exposed to direct sunlight during the day (10:00 and 19:00), and the plastic blinds create a greenhouse effect, where, for several times, the hot street was cooler than the inside of the house. There is not a proper ventilation in the innermost part of the room (except for a small odor fan inside the bathroom). Whenever we took a bath, or did some cleaning on the house, we noticed the damp air for quite some time (this is due to the poor ventilation stated above).
2) Privacy: Despite having a mirrored window and a matte finishing on the front door, because of the heat mentioned above, they where several times opened (to try to freshen the apartment). The windows and the door have a nice 2D tilt hinge feature. Nonetheless, because of closeness to the street, we noticed that most of the people passing by peeked inside from curiosity, making us feel unsafe and without privacy.
During the night this is even more obvious because the backlight of the apartment renders it completely visible from the outside. We had to have the blinds down almost all the time.
3) Surroundings: Despite being a relatively calm neighbourhood (during a particular Season, such as the summer, where most of the residents are away on vacation), we couldn't help but notice the poor insulation from the outside noise (especially with the traffic, and the street garbage municipal disposal service, which startled us every night around midnight). There are some young expats, that usually tend to be noisy during the night, but that was not a huge problem, in comparison.
The hosts were affable and readily available to help whenever needed.