We stayed at Daniela's apartment for one week in June. We liked it very much and would definitely recommend it. The highlights are:-

1) the apartment itself is marvellous: very clean, light and airy, very high ceilings, well-equipped (everything plus a coffee machine), plus a well-proportioned garden (not sure, but seems to be a rare feature); the apartment has a soul;

2) location is superb: in Alfama (which is an ancient district of Lisbon set on hilly terrain with curling streets usually too narrow for a car and small squares packed with restaurants), but not very far uphill, so you feel the essence of the district, but can access transport links in no time (i.e. 2 mins of walk to Museu do Fado); small shops and ATMs within 2 mins of walk too;

3) the hosts are very friendly and responsive: it was a pleasure to meet them;

4) point to know: second floor with stairs (not a problem, just for information);

Overall: very different from conventional hotel-based holiday experience - as if you actually lived there (feels like you are a resident rather then a tourist). Very interesting.