I loved this place and didn't want to leave! I've stayed in many apartments in Lisbon (and around the world) and can be a bit bit particular. This place is so spacious and clean and you have everything that you need. I felt right at home.
In regards to previous reviews about noise - I'm pretty sensitive to noise and also work online and need things pretty quiet. While the upstairs can be footsteps and joyful child sounds, I found that it no longer was distracting after the first day. They get quiet after 9pm. In general I find Lisbon apartments loud and if you're below anyone there will be footsteps. This really wasn't distracting. Occasionally on a Friday or Sat pm there can be street sounds but only for a very short period (I'm a light sleeper). There's an air con that can be used as a heater or air conditioner or fan as well..and that blocked out any sound. Without it, it's still pretty quiet.
There's a space heater in the living room so I could stay cozy there during the day.
The apartment is beautiful with a balcony and light streaming through. Of course the location can't be beat. Also check-in was easy. Marcelo checked me in and stayed in contact throughout my stay. He was helpful when I needed small things.
One note - the stove was in lock mode when I came in to use it. I had to google how to figure out how to unlock it. Sounds like a small detail but just check the stove and make sure you know how to use it when you check in. It's super simple once you know the button to push. It was a new style of stove for me :-)
There's a reason why this place is often booked up. You'll really enjoy it. :-)