Enjoyed my stay in Lisbon at Alexandre and Carolina's place. It was exactly as described and was in a really convenient and fun location in Bairro Alto neighborhood. The hosts were very communicative before and during the stay.
As has been mentioned in previous reviews, the only negative aspect was some of the noise in the building (upstairs neighbors walking and making noise above bedroom) and from the street (early morning garbage trucks etc.). This could just be a cultural difference that i'm not used to with Lisbon, but would recommend bringing earplugs for sure if you are sensitive to noise!