Our place is on the Archways complex and Nicholas did not bother to install any bars on any windows, they did install patio doors that take approx 15 seconds to take off their hinges though!!!
We, and others have had bars installed, but one theme that we have picked up on is that no one gets burgled when there's no one visiting. If they believe there are mega rich (I wish) tourists in then they'll give it a shot, if the place is obviously empty then no one bothers to break in.
Its obvious when someone is in residence, towels out to dry, sun beds scattered around etc, and always assumes they are not bright enough to watch you during daylight hours.
The theme continues that almost every attempt is in the late hours of the night 0500 onwards, rather than say 0100, when you might return and disturb them. Archways has/had a night-watchman - he normally goes to sleep at 1030 on one of the communal sun beds, so he has a limited deterrent factor!
We take all valuables to the bedroom and lock ourselves in (en-suit available).