This website has photo's taken around the area:-
http://gazetadigitalarquivo.blogspot.com/search?q=
It clearly shows how detached the apartments are from the Ocean Club, and the wall between them. Also the front windows of the apartment are recessed in a porch.
If you scroll down you can see an aerial photo. This marks the tapas restaurant and the back bedroom where the children were sleeping.
Someone on another forum used Google Earth to measure the direct distance. It came out to 70.5 metres (around 230 feet). He also estimated the walking distance to be between 120 to 130 metres (about 395 to 428 feet).