wpcoe, what you might like (I dunno), is a small one or two bedroom house with a small patio area without a large back garden. You'd be the absolute owner, could paint or repair or remodel as you wished, be more removed from neighbors (some condo or depa walls are not all that thick), have good security with your own locks, and maybe even have a dip pool or slightly larger pool in your mostly cement patio.
As a new person in town, I'm sure your landlord and his realtor friend are just fine, but ... umm... well, ask around and check into things a little more than just with one person. Don't just rely upon one person's word or recommendations. Try to get a feel for the "Spanish prices" versus the expat-targeted prices. You can check classifieds in the Diario and other Spanish-language websites for houses for sale "Trato Directo" which means "direct sale without agents or agencies" You really only need a good Notario for the purchase, to insure the papers are in order, etc, etc.
With a little luck or poking around (be patient), you could come across a tiny little "Mexican house", buy it for relatively little, invest several thousand in fixing it up, and have a good solid place for 1/2 the price on many expat-oriented websites. (My friends will love me for saying this.)
Just widen your circles a bit. Usually, a friend of a friend is a good contact, but there are those cases where... umm... your enthusiasm may overtake your judgement due to the relationship. (I have no idea who your landlord or his real estate agent friend is.... They might be good friends of mine!)