Diogo and his apartment were both excellent! I stayed there for a long weekend with my boyfriend and another couple. Diogo was incredibly friendly, welcoming and hospitable - he was very responsive, took the time to both pick up my friends at the train station as well as my boyfriend and I at the airport a couple of hours later, gave us a great overview of what to do/eat/drink/see in Lisbon and was accommodating with our checkout times. His apartment was also charming, spotless, in a great location, well equipped and very comfortable for 4 (and I think it could easily have fit another 1-2 on the sofa bed). I would happily stay at Diogo's again and highly recommend the place!