The location of Gaspar's place is unbeatable. Even though it's close to a super busy street, you get lots of silence. You'll find all the basics that you need in the kitchen and the bedroom, and it is a small but cozy loft.
Communication was always good with him, even though he was on his own vacations when we were in Porto.
The only issues we had was with the towels, there were a few stains on them and the body-wash was mixed with water or was really runny... making it basically impossible to have in your hand for more than 3 seconds.
Finally, beware of the parking. Gaspar mentions that you should let him know in advance the type of car that you have so he can make special arrangements. We were driving a Citroën Cactus, when bringing the car to the upper floor of the parking lot, one of us had to get off the car to direct each other to avoid scratching the rental car. Just keep in mind it's small :)!