We came to Lisbon on NYE and stayed for 4 nights. We had a lovely time at Catarina's place, as she and her mom were very generous and helpful in all regarding to check in and check out times.
The apartment is very stylish and vintage cameras themed, just 5 minutes walk from Rato metro station and 10 from Marquês de Pombal.
*NOTE*: the apartment is up a small hill which is a bit hard to those who carry a heavy luggage.
All in all a great place, 2 metro stations (on different lines) nearby is a big plus!