Great location, worth staying for that given the mid range price. Apartment itself is fine, everything quite cheap and flimsy but most things work and it is a good size. Building is very old and a bit mouldy but fine in the apartment itself. You’ll need to be able to walk up a lot of stairs, which should be expected for that area of Lisbon and is worth it for the character.
Door is very difficult to open - one of the reviews below was the only way we could open it, as they said, turn the key to the right then put absolutely all your weight on it and push down on the right incredibly hard and it will just about open. Worth asking for a phone number in advance of arriving in case you struggle to get in the apartment as they can take a bit of time to reply given it’s a service company not an individual.
Also note that you have to pick the key up from elsewhere (20 min walk away) by 10pm, otherwise are charged to get it at the apartment itself, which is a bit cheeky given it’s just from a lockbox outside a different building… so factor that into your arrival times and costs.
Overall worth staying there as a couple if you’re not looking to spend too much money for a very good area of Lisbon.