Overall, this was a good apartment for a leisure trip to Lisbon, but not perfect for remote working. The kitchen is modern, and having a dishwasher & washing machine was handy. The hosts left ampul supplies for everything which was appreciated, and there's a mini market right nearby down the street to buy anything needed. The bathrooms are good, with strong water pressure in the showers.
As others have noted, trams and people go straight past the apartment, on the street level - so close you can touch them. If you open the window shutters at all, there is no privacy whatsoever, people look straight in 24/7! The internet speed was fantastic and reliable for two people working remotely. However note the only desk is the living room table. I would recommend that the hosts fix the internal doors, which are all broken and therefore do not shut - this is an issue if privacy or quiet is needed, between the bedrooms and the living room.
We did have some issues with communication with the hosts - we couldn't locate the hairdryers, which were stuck in drawers that didn't open, so we didn't know they were there. It took 5 messages to 3 people across 3 different platforms to finally get a response 3 days later, when it should have been a very quick query resolved immediately.