Although I didn't see João during those 5 days we were in Lisbon, we were in touch all the time and he was really hospitable and ready to help us anytime. Apartment is pretty similar to pictures and on great location, and it is quite easy and quick to get to the city center by foot as well as by tram. Stairs in building may represent only problem because there are smelly a little bit (which has nothing to do with João's apartment, it is from lady next door) and are very steep and light is automatically on but right in front of apartment doors, which means when you get up the stairs.
But all in all, apartment itself is quite good :)
Wouldn't mind to come again.