My Cousin and I were staying here for 5 days, in the bunk bedroom, and we had a lovely stay.
The place is situated in the centre, surrounded by several metro stations, and the famous Rossio square. From there you can get the public transport to almost anywhere, but keep in mind Lisbon is a hilly city.
We didn't get to meet the host, but he was always quick in replying to our texts.
We spent most of our days outside the apartment because we wanted to see as much as possible. The time we did spend at the apartment was very pleasant. Other guests were nice too.

Great value for money!