My partner and I had an excellent stay in Lisbon. We absolutely loved this apartment. It was very clean and bright (both windows face the wall therefore there is almost no natural light in the apartment), but the problem was solved by a very good arrangement of bright lamps and painting the walls white. The apartment was quite small, but it had everything we needed. The flat feels brand new. In January, when you enter the apartment, you may feel cold, but there is air conditioning, which can heat the whole apartment. Be careful when going up and down the stairs - they are narrow and steep.
The location was perfect - walking distance to main tourist spots and near a lot of fun bars and restaurants, but the apartment was completely quiet.
Both Fernando and Tiago were very helpful and easy to communicate with. Both recommended all the shops, food, sightseeing and historic places.