Really enjoyed my stay in Rex's apartment. The apartment is as advertised and it is perfectly located at the edge of Alfama, so you are close to everything but the area is quiet at night. It is very close to the Metro also which is convenient for travelling to the airport and if you want to reach an area in the city quickly.
Check in/out and communication was perfect. Would recommend and I would book it again if I returned to Lisbon without hesitation.