Staying at Diogo's Chiado apartment was perfect for me. The location is absolutely perfect. You are in the middle and can go up (Bairro Alto) to great things, down to great things (Cais do Soudre)... Pretty much right next to everything. You can walk to Alfama quickly as well as the heart of the city (5 min).

Within 10 min walk (maybe up and down some steep hills as it's Lisbon) you can to many great restaurants, cafes, and bars. Many viewpoints.

Diogo is super friendly, helpful, responsive and gives great tips on places to eat. He met me perfectly on time (I think i was late due to customs). He helped me throughout my stay which was extremely helpful. Was very nice to give me a couple of gifts, and provided some essential things you need in an apartment (toilet paper, and towel set for example)

The apartment itself is nice sized, good decoration, clean, and the noise proofing in the master bedroom works very very well as I stayed on weekend and people like to party. The balconies are great to overlook the city.

Across the street is Bairro Alto Hotel which can be a resource for quick sit down breakfast, storing your bags (they let me even though I was not staying).

Bottom line, if you want to be in the center of Lisbon and have it easy getting to things, and stay in a great place, I would recommend Diogo's Chiado.