The apartment is nice and clean. The balcony is great for an evening drink or for an early morning breakfast.
The location can be great or horrible... Depending on you, your sleep sensitivity and your night plans in the island :) Great in the sense that it's close to everything! All the great bars and restaurants are in less than 5min walk (many are just downstairs). Horrible in the sense that if you're not planning to party and willing to sleep early, that might be difficult as there's quite a lot of noise in the square below.
Other thing that would have been nice to have: dishwashing liquid so we don't have to buy a full one for 4 days stay.
This being said, we really enjoyed our stay and Maria's apartment was confortable and super central.