We enjoyed an excellent couple of nights at Jorge's apartment. The previous reviews are pretty much spot on - Jorge was friendly, welcoming (despite our very late arrival) and always ready to help but never intrusive. The perfect kind of host.
The apartment was meticulous, modern and cosy, with all equipment and amenities kept in great condition (having a kitchen really helped). However, as with most older buildings, and as Jorge openly mentions, the sound proofing is limited and external noise will likely bother light sleepers. From the bedroom, the noise is limited to (unintentionally) noisy neighbours beside and above you; the street noise didn't go beyond the living room. There is a flight of moderately steep steps to climb to get to the apartment.
We found the location to be excellent. Just a short stroll up the street is an excellent viewpoint for seeing Lisbon. Beside it is the Gloria funicular (return trip tickets sold onboard, free if using the Lisbon card, charge varies if using a contactless ticket, but note that they generally do not accept luggage) - a pain-free way to travel down to the Rossio train station (for Sintra), metro stops (there are two stations on two different lines within close proximity of each other) and the squares and streets downtown.
Lisbon is an awesome city to explore and Jorge's place makes a great home base. Thanks Jorge!