Short: Our stay was perfectly well!
Long:
Communication with Sara has been quickly and direct and was in English and Spanish. All was clean and well equipped. Ee did not have any issues with the neighbors but we also didn't stay up all night in the apartment but went out. We watched a movie once and there was no issues regarding the audio volume. So everything was good. Only one thing to mention is that the neighbours have a parrot or bird as pet which whistles in the morning around 5/6 AM. Isn't so loud that you couldn't sleep so it's ok but just so you know.
All in all we were glad to have such a well located and nice apartment.