I was in Alberto's place for 3 nights with another couple of friends. Alberto's place is an ideal Airbnb. It's well located, clean, comfortable, full privacy, well worth the money. In addition, Alberto is very kind and helpful. It would be hard to find something better, especially for this price.
One thing you might want to notice, is that despite the neighborhood being nice and close to the center, from the closest metro (no other transport nearby) it is about 10-12 minutes of walking uphill. So it's a bit uncomfortable if you have heavy luggage to carry, or if you want a venue right at the very center of the city.