I don't think it would be an easy job to find a better accommodation in Lisbon than Nuno's place. Perfectly located in the Bairro Alto in a quiet street you have everything you need available. The apartment was clean, the shower warm, the internet fast, and Nuno super friendly, welcoming, and responsive. Also, it was no problem to keep our keys to the place a little longer since we had a late departure. Nuno made sure we had a great stay and I would definitely come back.
One drawback was that there was a smell from the drain in the apartment which I'm not sure is anything Nuno can change. It rained a lot in the period before we arrived and the whole city smelled like sewage.
The good thing was that the apartment is on the third floor and leaving the windows open all day was no problem (very safe area) - problem almost completely solved :-)