Yellow House is a great choice if you are looking for an accomodation in Lisbon.
The hosts, Cristina and André, were very nice. They picked us up in the airport at 7.15 in the morning and gave us a lift to the place. The appartment was clean and it had all the necessary things for our stay. It´s a modern and good located place, very close to the center and with nice restaurants and cafes around.
Check-in and check-out was very flexible, which was quite helpful for our trip.
We really recommend it!