Alex's place is well located in the middle of downtown. You can reach most things on foot, but even if you need to move around a traffic nod is 7 mins walk where you can catch trains/metro/tram. The apartment is in a renovated authentic building, with thick walls, which was especially great with the 38 degrees outside. It was clean, the bed comfy and the views amazing. We arrived with a car from Spain, and the private parking was a must. The parking is super secure with a gate and fence.
Alex is a welcoming and helpful host, I wouldn't stay in any other place in Lisbon. Totally recommended!