Nice and well-equipped apartment, good value for families; not so much for couples. A bit far from the main sites for my taste -- I found that Lisbon is a very pleasant city to walk around if you stay closer to the Baixa-Chiado or Alfama areas, where most of the landmarks are located. Still, the apt is close to 2-3 places of interest (Casa Fernando Pessoa, Estrela Basilica, Campo de Ourique market), a supermarket & a few good restaurants. Not too far from the metro -- but not too close either.
Unfortunately, I found the check-in process to be disorganised and inconsiderate. Marisa gave us a 30 min window to show up -- if we missed it we'd have to wait another 3 hrs to do it. Not only that but the apt would only be cleaned several hours later, so all we could really do was drop off our bags and wait around at the nearest cafe -- which, of course, was a major inconvenience given that this was NOT an early check-in.
All in all, I'd recommend Marisa's place if you're in a party of 3 or 4 and have already covered the main historical sites (or are not interested in doing much tourism). Make your check-in arrangements way in advance and you should be fine.