Really enjoyed our stay is Nuno's second-floor flat in Bairro Alto which was clean, spacious and located just five minutes' walk from the riverfront, several great pastry shops and the famed 28 Tram.
Clean towels and coffee machine very useful and kitchen had all we needed.
Only thing to note if you lack mobility at all is some quite steep stairs to get up there - firstly up the alleyway ('beco') off Rua de Boavista, then up to the second floor flat itself.
But the view out of the front windows (over the beco towards the Tagus River) is well worth the effort.
Would recommend.