This is an excellent place for a stay in Lisbon - 5 Stars on location, atmosphere cleanliness, amenities and hassle-free public transport connection to the airport.
Location: The flat is in a quiet residential street, but there are plenty of very authentic restaurants and little corner shops in that street for quick meals or basic supplies. A few minutes walking in any direction brings you to the bigger tourist attractions and public squares as well as Hop on Hop off Bus stops. Getting there from the airport was straight-forward on the metro system and took ca 30 minutes; the only word of warning to those not firm on foot: you will have to drag your luggage up a hill for about 100 metres before reaching your destination.
Atmosphere: The flat is about 200 years old and has the original wooden beam structure on display, which is lovely. The ceilings are high, which makes the hole place airy, and it has good noise insulation - we liked it so much we just crashed in the spacious living room to re-charge after long hours out in the sun, and before going out for dinner
Cleanliness & Amenities: Everything was very clean, and the bath was lovely surprise because it is very modern and has everything you need including a great shower, hair dryer, towels and shampoo. The kitchen has all the basic supplies including a water kettle, dishes need to be done by hand though.
We would recommend this for anyone looking for a clean, quiet self-catering stay in Lisbon at a good price. We also recommend reading up on the Great Earthquake of 1755 - the whole city makes more sense that way.