Simply Perfect! Everything you need to know about this studio has already been said earlier in all recommendations. Just to sum it up:
1) Great location - the flat is in the center of historic Lisbon. It is close to everything you need to see, so there is basically no need to use public transportation. Sights, restaurants, cafeterias, music clubs, shops, all are withing close walking distance.
2) Hospitable host - Zé is really helpful and well organized. He is easy and fast to contact. Although he was not able to welcome us at the apartment, his friend was there on time and gave us all the necessary hints about the apartment and its surroundings.
3) Convenient equipment - The flat is small and cozy but equipped with everything you might need during your stay in Lisbon. It even had an iron and hairdryer.

I definitely recommend this apartment for anyone looking for a place to stay in Lisbon. If we come back, we will try to book it again!