We rented Javier's flat for 4 days during a trip to Malaga that overlapped with my mother's stay. Unexpectedly, we only stayed in the flat for 1 night as it didn't suit our pretty specific (admittedly!) needs. We did not receive a refund given the policy.
Important to say that the flat is decorated nicely, incredibly close to the beach, and also convenient for getting to the center of town. Great for sharing with friends, particularly if you plan to be out and about a lot.
The downsides for us ultimately were 1) the lack of natural light and 2) the traffic sounds from a very busy street. Obviously it's a basement flat, but the pictures do give the sense of more natural light than is reality. The second bedroom, for example, has no access to an outdoor-facing window. The main bedroom faces the main road, and you can hear quite a bit of traffic noise which is important to know if you're a light sleeper. May not be a bother for most. The patio likewise faces that street, and so while it's a nice space, it is quite noisy.

All to say, flat is likely well-suited for most, but not for those who place a premium on natural light and quiet