Casa do Duque is a very clean, well equipped and furnished apartment that has everything travelers might need. The street is as quiet as a narrow cobbled street could be; there are no tourist crowds passing by. It is conveniently located within just few minutes of walking downhill to Rossio Square though on the way back one shall climb quite a steep hill, 4 minutes to the nearest supermarket or 2 minutes to a tiny but good grocery store.
The apartment is within meters from two good restaurants frequented by locals and cozy bar with Fado nights which is owned by Mario and Helder. The street is becoming a little bit noisy after 20:00 when people gather in front of the restaurants.
We mostly interacted with Helder. Very accommodating, responsive and simply the most pleasant person, Helder is the best host we have met in our numerous trips. With him being one minute away on the phone or in person we felt safe and in the good hands.
For a very reasonable price he took us on a day trip to Obidos, Batalha, and Alcobaca and acted not just as a driver but also as a very knowledgeable tour guide.
Overall we highly recommend this apartment.