Cyril's place is beautiful and very clean. It's deceptively big, with plenty of storage and great facilities. There were a few nice touches, such as shots of ginja (local liquer) and shower products in the bathroom. Cyril is a fantastic host - he was there to greet us and show us around the apartment when we arrived and was very quick to respond to messages before and during our stay. He also sent us lots of recommendations for things to do.
The only negatives were that while the description lists air con as a facility, this is actually only in the top floor living area and not in the bedrooms below; as one of the bedrooms faces the street and overlooks a bus lane, it can make for a noisy night if you keep the window open. We also had a small issue with cockroaches, despite the cockroach deterrents in place - although we did notice a few in the city in general, so perhaps this is a larger issue in Lisbon!
Overall, however, our stay was wonderful.