we really liked the apartment.
Arrival: Joao was very nice and sent bottle of wine to greet us which was very much appreciated. We were able to check in earlier than usual (around 1pm) although a little later than originally discussed (12pm) - our plane arrived at 9am so we had to chill out in the cafe until the apartment was available.
Location: Location itself is great - very central, close to the final stop of tram 28, metro, buses. less than 10min walking to Rossio. two small downsides: it is very up the hill so for some older people it may be hard to go up the hill and there is a group of people selling drugs on the way to the place which can make going there a little uncomfortable if you are alone.
Apartment: apartment is nice, very clean, very safe. it was just two of us so space was not an issue. it should be good fit for a family with kids but may not be best suited for few couples. we were there at the end of August and it was very hot in the apartment. we tried leaving windows and shutters closed during the day (as per suggestion), but it didn't help much. Joao provided one fan but it didn't help too much. it was small and was not possible to tilt up or down. if you plan on using washer machine, bring detergent as there was none in the apartment. also you may need to have few cloth pins for drying out towels or clothes to make sure that they do not fly away with the wind.
Overall the apartment is good value for the money, and perfect option during non-hot period