This is an lovely, secure, and completely updated apartment with everything you could possibly need and everything in great condition. It's extremely well located for visiting most of the city's sites and just a block from absolutely gorgeous areas perfect for wandering. And the internet is blazing fast. We thought it was a really good value for the price and one of the most well-thought-out Airbnb's we've stayed in.
However, several bars below the unit are noisy until very late (5 am!) on weekends. Weekdays, are quiet, but weekends are loud. No music, just loud voices and occasional outbursts of song!
If you have a car, plan to park in the recommended ramp. It's super close (basically around the corner), but even with Carlota's discount, almost 20 Euros per day. Carlota may have a spot you can use for free, but she may not, so build parking into your budget.
Carlota was very flexible with our check-in time, but then we ended up hiking a bit farther then anticipated to get the keys. (We never actually met Carlota, but Mamen at the hostel was lovely and very helpful.) Check-out took almost an hour because there was an issue getting the parking tickets we needed. Not really anyone's fault, but something to keep in mind as a possibility if you are on a fairly tight schedule.