Wonderful truly Lisbon-vibe flat. Very clean and cozy. Rui and Elsa are very friendly and attentive hosts. We came to the conference with our team and it was very good choice.
But the one important thing you might need to consider - apart of the great flat - there's a very very noisy wine bar right under the windows which works till late(very good wine out there though), and either you need to take a pair of ear plugs or you sleep so well that you don't care about noise from the bar.