Addresses can be difficult in Spain.
Especially since maps arn`t easy to find beyond tourist leaflets.
Try this although the address you gave is not recognised, if you can get the post code Mappy works off them.
http://es.mappy.com/
Many addresses are complicated and confusing, it may not be known until you get a taxi, but that may prove unwise and costly.
Many Urbs can be apt blocks in cities, some are large Estates, they vary a lot.
I couldn`t find any area in Alicante called La Nucia on mappy, only a calle La Nucia.
But putting into google La Nucia gives these details.
http://www.bancajahabitat.co.uk/information/tourist-information-la-nucia.aspx
So I went further and found this
http://www.paginasamarillas.es/fichas/ig/mega-pc_198154775_000000001.html
There address is Urb Cristal 33, La Nucia and gives a postal code of 03530, so not too far from your friend, maybe worth a phone call.
Mappy shows La Nucia now from the postcode, but no Urb Cristal.
http://es.mappy.com/#d=la+Nucia,+Espa?a&p=map