for your question on crime,and I can only speak for 2 areas
1st just outside Antas(20 years ago) I was in the process of moving over so my house was empty for longish periods,not long after I had a load of white goods delivered and while I was in the UK my neighbour spotted a bit of paint on my door,he is a canny old Spaniard and new this was a marker for people to rob the place so removed it,I suspect the deliver drivers.
2nd when I had rented a place in Mojacar I know I had closed and locked the patio doors but in the morning they were half open they were not very strong so a bit of chain and lock solved that,luckilly the burglars had been disturbed,
now that is over a 20 year period,
there had been a spate of muggings on Mojacar playa but the Guardia soon clamped down on it.
Like anywhere you live,UK/Ireland/Spain there is always a risk of petty crime,and as where you live you would be carefull do the same in Spain
apart from the big costas the Spanish have, to me, always been wonderfull people(especially when taking your money)BUT and it is a BIG BUT I have made the effort to speakadalingo
I have ALWAYS found the local police and Guardia very good and very helpfull