My girlfriend and I had a great one-month stay at Maria's place.
I was greeted by Maria and her father who told me everything I needed to know about the house and some nice local restaurants. They left us some fruit and wine.
The flat was bigger than expected and it looks like it was recently renovated – we liked the open space kitchen and living room, big windows and lovely outside area. The kitchen has everything you need including a washing machine and dishwasher. However there isn't an oven, which should be ok for shorter stays, but we wished there was one.
The neighbourhood is quiet and very close to one of Lisbon's main arteries, Av. Almirante Reis. There you can find tube stations and bus stops, Portuguese restaurants and shops as well as restaurants and shops with food from around the world, Intendente and Martim Moniz being some of the most diverse areas in Lisbon. You're also at walking distance from the city centre and Terreiro do Paço.
All in all, we enjoyed our stay and would recommend to anyone, whether they're familiar with or about to know the wonderful Lisbon.