Pedro welcomed us into his spotless apartment. It was a great base for our week long stay in Lisbon with easy access to all the main attractions on foot or by public transport. There are loads of bars and restaurants nearby and a small supermarket one minute away.
The kitchen was well equipped and the bed was comfortable.
The only downside to the apartment, as others have mentioned, is that there is very little natural light. This wasn't a problem though as we were out exploring the city most of the time. I expect it stays quite cool because of this in the summer.
I'd definitely recommend staying in Pedro's apartment if you're visiting Lisbon.