I stayed at INDY House for a couple of weeks in July. Overall, I had a positive experience!
Pros: Communication with the host was always fast and every question/request was dealt with quickly. I needed to checkout 1h later and that was granted, which I'm very thankful for! The location is great, very close to the metro station and some nice restaurants, but be prepared to go up and down the hills like most of Lisbon. The building has some nice common areas like a living room and a beautiful garden. The team looking after the building was always very nice to me.
Cons: For my first 10 days, wifi wouldn't work properly in my room. After that, it started working better but only in a specific area of the room, not the entire room. It also didn't work well in the garden and, as I was working, I had to use my phone as a hotspot for that. Not getting clean towels and bed linen for 2 weeks was also not ideal, having a change after a week would have been great. Depending on the number of people in the building (they had permanent residents and AirBnB visitors), you can get a lot of noise coming from the rooms upstairs or the communal kitchen.