I stayed at Tin's apartment with my girlfriend for three nights. We both were sick, laying in bed the whole time so we didn't see much of the city. But Tin was super friendly, gave us advice how to recover quickly and did his best to make us feel as comfortable as possible.
The rooftop is really awesome - great view, great sunset!
The apartment is in the 7th floor, no elevator, just in case you're bringing a big suitcase…
I'm pretty sure I will come back one day to experience Lisboa the right way and I'd be happy to stay with Tin again.