This is an excellent apartment. It is well-maintained, spotlessly clean, quiet, and well-furnished. It has all the modern conveniences--clothes washer, dish washer, TV, etc., etc. The WiFi is fast and reliable. There is an elevator. The apartment owners--Marc and Carina-- are great and very helpful. Marc will respond to your rental inquiries almost immediately, and Carina will spend all the time you need to get the lay of the land.
Across the street is a Fado theater with a pretty good show. But don't sit in front rows since their sound system is not very good, and the performers unfortunately use microphones. Of course the mics detract from the intimacy of the performance. Also there is a bank ATM across the street. Be aware that In Portugal you are allowed to withdraw only Euro 200 twice a day.
It is a steep walk uphill to the apartment from downtown Lisbon if you decide to forego taxis. But do not rent a car to see Lisbon. The street system and the traffic back-ups make driving very complex and challenging. It's better to use a taxi; they are not expensive. If you use a taxi to get to the apartment, tell the driver to take you to Rua da Misericordia and then tell him to stop when you see the apartment building at Travessa da Espera 3. Do not tell the driver to take you to Travessa da Espera. The back-street complex off Misericordia is complex, and inevitably the driver will enter the address in his GPS and proceed to get himself/herself lost. Cars cannot access Misericordia from Travessa or the reverse.
The neighborhood is bustling, but it lacks a near-by supermarket and a really good restaurant. For the former, you need to take a rather long down-hill walk to the MiniPreco. It has a good selection of foods and wines. But take a taxi back to the apartment with your supplies unless you are into long-distance, up-hill hauling.
As for restaurants, we highly recommend the Floresta do Salitre at Rua do Salitre 42D--not far from Avenida da Liberdade. It is an easy walk down hill from the apartment; the walk back is more of a challenge. This is a family-owned restaurant that offers well-prepared and generous portions of food at reasonable prices. It is popular with the locals, and is highly ranked on Trip Advisor. The grilled pork and the grilled grouper were in particular excellent. The service is polite and attentive. Their wine and their own-private port are high quality and a bargain. They do not take credit cards.