Joao is a very nice and considerate host. Although he doesn't live in the apartment, he is very easy to contact and is very flexible. He provided with tourist information about Lisbon.
The apartment is quite old and a bit dilapidated, but Joao kindly provides his guests with towels and helps them with any issues they might have. There is a kitchen where you can cook and a washing machine. There are lockers to store valuables. When I was there, there were two other guys sharing my room, equipped with two bunk beds, and one other guy who had a room to himself. Many of the guests stay for quite long periods of time.
The area where the apartment is has a residential character and is quite traditional. There is a metro station within a fifteen minutes walk and local bus services. There are some nice small local restaurants nearby and convenient shops.
If you are expecting a very flash apartment you might be in for a surprise, but overall I highly recommend Joao as a host.