The location is good. You're near two grocery stores, there are bunch of random bars and restaurants nearby, and there's an alimentos store just on the other side of the park, so you can get your basics. Yes, it's a hike up, but that's reflected in the price. It is, as the host pointed out in response to another review, on the 4th floor. The challenges were:
1. For an unbiased source, Google maps says it's a 7 minute walk from Parque infantil Estrella del Sur to the address. By the time you account for almost a minute for going up or down the stairs, plus carrying beach stuff, and random things like waiting on lights to cross the street, count on about 10 minutes to or from the beach. Not a huge deal, but it didn't meet our expectations based on the listing.
2. The stairs. Yes, it's on the 4th floor in the European style, 5th floor in US numbering. I took a video going up because my wife and I were debating how long it actually took vs how long it felt. It took me, an athletic 1.9m man going at a normal pace, about 50 seconds from door to door, including unlocking the front door. If you have mobility issues, consider this issue. It didn't bother us too much because we read the host's previous reply where they clarified it was on the 4th floor and we expected it.
3. The AC works great through the whole apartment *if* you're willing to keep the doors to the rooms open, since there's one AC unit in the main kitchen/dining area. We have two young kids and we had to choose between either them sleeping hot, if we closed the doors to their rooms, or potentially waking them up while we did dishes, laundry, had a glass of wine (night, after they're down) or cup of coffee (morning, before they're up), if we left the doors open but let the cold air in to their rooms. Not ideal.
4. Finally, the listing says there will be things such as body soap, hand soap, clothes iron, and cooking basics (oil, salt, etc.). Most of the toiletry and cooking basics were missing. By the time we added up the basic things that we bought like handsoap, body soap/wash, salt, olive oil, and so on, we found that we spent over 20€ at the supermarket getting basic items like these.
Overall, though, the place is good-but-not-great. We feel that we got solid value for what we paid and, while we wouldn't avoid this property in the future, we wouldn't stay there again if we had other choices.