I really enjoyed staying at Ana and Hugo's room/apartment. They are amazing hosts - were nice, helpful, flexible and communicative. The room I lived in was very small but cozy. I shared the apartment with another 2 people which made my stay even better because they were lovely people.
The apartment is located in a great location, super close to a metro station and train station (for going to Cascais/Belem) and in a place very convenient to get on foot to almost anywhere in Lisbon.
The only thing I think might be worth mentioning, is that the apartment is on the 5th floor with no elevator, so be prepared for that! :)
Also, it is right at the top floor (or rather half-floor), at the attic with low ceilings so I wouldn't recommend it for a longer stay for tall people ;)