Pros: The apartment is in a good location in terms of getting around Lisbon, within walking distance from the river and main shopping area, bars and cafes, etc. It was very clean and basically what you see in the photos is what you get. Great shower and comfy beds. Hosts were really helpful and responsive.
Cons: The balcony didn't really get any sun so it wasn't ideal for sitting outside (probably fine in the hotter months, though—we were there in February so it was warm but not boiling). It was also pretty loud at night as the apartment is located right on the street. Also, the two bedrooms are very close together, separated by only a thin wall, so you can really hear everything (might not be ideal for two couples, for example). Upstairs got nice sunlight but downstairs was quite dark and chilly.
Overall, a good base for a short and central stay in Lisbon if you don't mind a bit of noise at night and aren't fussed about hearing what's going on in the bedroom next door.