Carlos' place was exactly as described, cosy and clean. The flat is located really close to the historical centre (5-10 min walk) and a walking distance to the Malagueta and Caleta beaches - 20-30 min (or 5 min by bus).
There are lots of amenties nearby (supermarket, pharmacy, eateries, etc.)
Most importantly, it was quiet so we could sleep really well.
I would also highly recommend to arrange the airport tranfer with Carlos - the driver is really friendly and gives a lot of tips on places to visit and making your way around the city.