Loved this apartment!! It's in Alfama in a historic building (on the third floor with no lift, bear in mind) and the location is fantastic. Close enough to walk to the sights of the historic centre and the metro is a 5 min walk away for visiting further afield.
Gonzalo was very communicative (via WhatsApp) and welcomed us to the apartment, showed us the old building's quirks and gave us tips of what to do during our stay. When the hot water went out he replied within half an hour with a video of how to easily fix it.
The apartment is lovely, all dark wood floors and old doors, with two balconies. The shower is interesting as others have pointed out but I thought it was great! The oven wasn't working at the time so it was gas hobs only but this didn't bother us. There's also a little book left by precious guests with suggestions of where to go and eat which we found very helpful for reference.
All in all staying here made our Lisbon holiday practicallyperfect, with the central location and the true Lisbon old town feel. I can't really fault it!