We had a lovely stay here. It's really in an incredible location and the apartment is nice, clean and comfortable. It's right next to everything in old Lisbon that's worth visiting and there are some great restaurants nearby. Having the kitchen, crib and high chair was very helpful with a young baby.
My only complaint with our stay would be that the Wi-Fi didn't work 99.5% of the time. This itself is not a big deal as Wi-Fi shouldn't be an important aspect of a vacation, but I had a business call I needed to join one morning. What was a bit frustrating was that the hosts never replied to any of the three messages I sent regarding the issue which makes me think it's a recurring problem that just hasn't been dealt with.
Apart from the Wi-Fi, I fully recommend staying at this location.