The host: we were checked in by Catherine's partner Frederic. Actually "checked in" doesn't come close to describing it; Frederic took a lot of time to make sure we knew everything we needed to know, not just about the apartment but about Málaga itself. He was an incredibly gracious host: funny and charming and extremely helpful. It was an extremely pleasant experience, and immediately made us feel like we were "at home" in the large, busy city of Málaga.
The apartment: it was perfect for our needs and exactly as advertised. A clean, well-furnished single-bedroom apartment with everything we required. I prefer to eat breakfast in, so the small kitchenette was ideal for me to cook eggs, toast, coffee etc. My wife and I also like to travel light, so we really appreciated the clothes washer so we could get everything clean for the next leg of our journey. And of course we loved the ubiquitous (in Spain, at least) black-out shutters that allowed us to sleep as late as we wanted (jet lag, anyone?) without letting any light into the bedroom.
All in all, Catherine and Frederic offer a great apartment at an extraordinary value. The location is VERY central, a few blocks from the busy Plaza de la Merced and close to all the best sights, shops and eateries in Málaga. We were completely satisfied with our stay.