The roof leaked, the lock kept nearly coming off, there was no hot water, construction on the apartment had decibel levels to prohibit activities (sleeping, conversation, relaxation, etc) on-site from the hours of 7:30am-6pm, the main gate didn't actually lock, and the only mosquitos we encountered on our full week trip made residence inside the apartment.
The only positive about this place is the location. Near to a lot of good restaurants and a beach.
If all you need is a place to store your stuff, this will work. Otherwise, find any better place. Even if so, there are cheaper and more secure places to keep your crap while you enjoy San Juan.
PS No ceiling fans or central AC.