Carmen was extremely helpful (communication in Spanish via WhatsApp). Check-in was arranged by key pickup at a nearby hotel. Late flexible check-out was allowed without any trouble.
The location within Puerto Pollensa is very good. There is free parking all along the street, a small supermarket Spar down the road, a large supermarket Hiper a short walk, and many close options for brunch and dinner. The beach and walkways are a few minutes down the road so convenience is very high.
The apartment itself is very very spacious with a large double, twin beds, as well as a big couch and a foldout mattress. There's inside and outside table seating and a balcony to have drinks and overlook the street. The kitchen is well equiped and 4 bath and 4 hand towels are provided. There are 2 bathrooms/showers, 1 ensuite and 1 communal both of good size. Both bedrooms and the living area had very good air conditioning and the wifi was decent too.
The only minor issues were the showers did not have warm water (not a big problem in August) and there is no soap/shampoo provided (so bring or buy your own).
Would very highly recommend staying in Carmen's apartment.