It's a beautiful small room in an inn that would be perfect for people visiting Lisbon for a short time. The location is very central and the room has nice details and the houskeeping is top-notch. It's was super clean and fresh with weekly cleaning too. The hosts always answered quickly to my questions and when I needed stuff they were helpful with providing me with additional equipment.
For a longer stay, like I had, the downside was a rooster living downstairs that started cuckooing loudly around 5am in the mornings and the longterms neighbours were pretty loud, so I wouldn't recommend it if you're looking for a very peaceful work-evinroment. But even for longer term it was managable after I bought noise-cancelling headphones and slept with them + earplugs too.
All and all, I think the inn is managed very professionaly.