Eduardo conveniently left the key to the apartment with the security so we could just walk into the apartment ourselves. The staff at the reception desk (the building is made up of hotel rooms and apartments), who all spoke English, allowed us to leave our big luggage at behind the desk while we went out for a few hours and then came back to check in.
The apartment itself is absolutely gorgeous, exactly like in the photos. The jacuzzi/sauna area is also amazing, we only went there once near the end of our stay and regretted not going earlier!
The apartment was stocked with cereal, soup, fizzy drinks and other stuff which was really handy for us.
The few times we texted Eduardo to ask him something on the first day of our stay, he was always incredibly patient and answered all of our questions.
The apartment is also located in an excellent area, and the panoramic views from the big windows (the apartment is on the 22nd floor) are absolutely stunning.

Overall, there's absolutely nothing we could fault with this stay, and I hope to be able to return to this apartment the next time I visit! Thanks again, Eduardo!