Just completed a great 5 night stay at Diogo's place. The apt is pretty true to the photos - the bedroom is clean and nicely appointed - same goes for rest of the apartment.
For those unfamiliar with Lisbon this location is fabulous and completely central - great base for sightseeing. However, as mentioned in other reviews it gets very noisy at night - I was fine with earplugs but something to consider. (As far as I could tell also, there was no A/C which during the height of summer I could see being an issue, but in Sept the strong fan Diogo provided was just fine)

Diogo and I didn't spend much time together outside of some brief conversations in the apt but he was always helpful with tips about Lisbon and Portugal.