I stayed in this apartment for 8 days during my last stay in Lisbon. There was a lot to like about the apartment and the experience. The location is central. The apartment is bright and relatively spacious. The water pressure was great. The kitchenette was well-stocked and fully functional. The WiFi was great. Tiago and Sonia left a bottle of wine for us in the fridge. They were super responsive and kind hosts. They even carried our (heavy) luggage up to the 5th floor while we were waiting for the apartment to be available!
Which is why I hate to write that my husband and I really didn't love our stay here. Though the location is central, it is also quite noisy. During our stay there was A LOT of construction happening in the street. The noise started early and continued on the weekends. There is also a cafe directly below the apartment that gets quite noisy on Friday and Saturday nights. If you aren't sensitive to noise, you should be fine. But it woke us up almost every day and kept us up at night.
There was also a strange sort of sewer-y smell that came and went during our stay. The the hosts had thoughtfully placed some diffuser reeds in the bathroom to counter the smell, but it was super strong so we ended up leaving it outside most of the time. It wasn't crazy. But if you are sensitive to smells, this might bother you.
The last things that led to a less-than-ideal stay was how scratchy the sheets were. I travel with AirBnB a lot and these are the scratchiest sheets I've ever slept on.
In a nutshell, if you aren't that sensitive to noise or smells, you'll be fine. Or if you're going out sightseeing all day and just need a place to crash, you'll be fine. But we were in Lisbon to work and needed a place to spend a lot of our days. This apartment wasn't great for that.