Glenn's apartment was exactly as we imagined it to be: small but with everything a couple might need for a short stay in Lisbon with great value for money. The kitchen was well furnished and we didn't have problems cooking at home in multiple occasions.
The apartment is located in Principe Real, a wonderful neighbourhood near Barrio Alto. It is at the top of a hill which means that visiting the city would often require going down and up, but that is just how Lisbon is.
In the end I would definitely recommend staying at Glenn's apartment!