Me and my family stayed some days in Lisbon and we were comfortable at the house, and had all the basics we needed for those days. There is not much space with 2 kids in the house, but we were never indoors anyway, so it served just right, although sleeping in the upstair room was a bit noisy in the morning...
Very close to the airport was a plus! And walking distance from many nice places, like the Science Museum, and access to all public transports.