The apartment at Portas Do Sol is an incredible location near the center of Alfama. There are tons of stores and restaurants nearby and the beautiful Teatro Romano outside of the living room window. We stayed for a month and loved the area!
Both of the hosts how worked for the property were super responsive and made sure to help out any way they can, in that way I can recommend any property that they work at. We had a lot of issues with the internet and since we work remotely this was a huge issue for us, however, both hosts made sure to do everything they could to get us suitable internet.
It is really important to note that the noise from any of the surrounding neighbors is very very loud. You can hear clear conversations from those above and below you. This isn't ideal for those who work from home and have called during the day, those with small children, or if you like to have slept a bit later -- footsteps upstairs sound like someone stomping.
We wouldn't stay in this specific apartment again, but we would rent from the two hosts again with no hesitation :)