Paulo is very kind and is happy to tell you about all of the great places Lisbon has to offer. He is very pleasant and a great host.
As far as the unit, mind the stairs, really. They are extremely steep and narrow. Had Paulo not been there to bring my luggage to the unit, I would have probably my injured myself in the process.
While the place is as pictured and centrally located to everything, there was a very strong odor of mold and/or smoke in the unit. It is particularly strong in the shower. My clothes even smelled of it upon check-out (had to spray potpourri afterwards to rid the smell).
With some attention put into making the stairwell safer and the place cleaner (in the aromatic sense) it would be a great stay.