The apartment is a nice location, right around the corner of Portas do Sol and we found Alfama to be one of the nicest neighbourhoods of Lisbon. Joao wasn't in town when we arrived but we could let ourselves in by using a lockbox.
The street its located on can be quite busy at times but the soundproofing of the windows is good, so it didn't bother us. The apartment is located quite a walk uphill which can be challenging for some.
The apartment itself is spacious and well designed. Main downside for us was the shower which is not draining well and the bathroom which doesn't seem to have a properly working ventilation. This is probably the cause of the moldy smell in the apartment. Also there are no dishcloths so you might want to bring these yourself.