My boyfriend and I spent 5 nights at Luis's place. The flat is big enough for two people and has all the equipment needed for that amount of time (sheets, towels, toilet paper, kitchenware -also we did not cook-, internet Wi-fi, fridge/washing machine). A coffee maker or at least a kettle would be handy though...
The flat is situated in an area that gets very lively after 10pm (before that time the neighbourhood is a bit dead and most shops/restaurants are closed until the evening) Well actually the kids in the school accross the street are taking care of the liveliness during day time!
Please note that it is on top of a hill and if you've been hiking all day you might find it a bit hard at the end of the day ^^
It is important to know that it gets quite loud at night (as already said by others) and that even with the living room window closed (bedroom has none!) and the bedroom door closed you can still hear what's going on in the street. Also the squeaking bed with its hard mattress and very thin pillows is not very comfortable. Anyway we were so wrecked after going up and down Lisbon streets that we did manage to sleep all the same!
All in all the place is OK for people who do not intend to spend the whole day inside and who need a place to crash after a long day visiting this beautiful city.
I only regret that we did not get a chance to talk to Luis much. He welcomed us, gave us the keys, explained one thing or two about the flat and left. I would have appreciated a word or two about the area and the nice spots/restaurants to go to...
Talking about restaurants: don't miss the Morroccan gem hidden only a few feet from the flat: Flor da Laranja, 206 Rua da Rosa. The food's fantastic and the lady running the place is sooo friendly you feel you're eating in her own home. Probably the best meal we had during our entire stay (although the grilled salmon at Os Jeronimos, 74/8 Rua Belem in Belem was also astonishing!!)
All in all we had a very nice time there :)