This was a great spot for us. It's a dedicated rental unit so you don't feel like you're stepping on anyone's toes and you know that everything that is in the space is for your use. Although we didn't meet Alex and Gemma, their assistant Norma met us and was very helpful explaining the space and providing maps.
You can't beat the location — only steps from the Sants station — so close in fact that our phone GPS couldn't seem to locate it (note that the street numbers on both sides of the street don't quite line up, the apartment is in the first complex you come to leaving the station).
Although the space is a little worse for wear with some paint chipping for example, it is clean, bright and well equipped. The neighbourhood seemed very safe. We got a lot of use out of the balcony, which overlooks a plaza and a fountain and our older son enjoyed skateboarding in the nearby park. We stayed there with two of our children (aged 16 years and 4 months) and had a great time.