Search for a villa with a pool in Istria and you get a thousand results with near-identical photographs: blue rectangle, sun lounger, low sun. The photographs are true and they tell you nothing useful. These are the things that decide whether a week works.
The pool itself
Ask for dimensions and depth, not a photograph. A wide-angle lens makes four by eight metres look like a hotel pool. Depth matters more than length if there are children in the group — a pool that is 1.4 metres throughout is unusable for a six-year-old without an adult in the water, and one that shelves from 1.1 to 1.6 changes the whole week.
Ask whether it is heated, and if so from when. An unheated pool in Istria is pleasant from June to mid-September and bracing either side of that. If you are coming in May, the answer to this question is the difference between a pool and an ornament.
Ask whether it is fenced or gated. Many are not. That is fine for adults and a serious consideration for a toddler.
Privacy is not a given
"Private pool" means the pool is yours. It does not mean nobody can see it. Plenty of Istrian villas sit on plots overlooked by a neighbour's terrace or a road, which is fine for most people and not fine for others.
Look for a walled or fully hedged plot if that matters to you, and ask directly rather than inferring from photographs — the camera is always pointed away from the road.
Bedrooms, bathrooms and who sleeps where
"Sleeps ten" can mean five double bedrooms or three bedrooms and two sofa beds in the living room. For two families sharing, this is the difference between a good week and a tense one.
Count bathrooms against people, not against bedrooms. Ten people and one shower is a queue every morning; en-suites change the arithmetic entirely. Ask whether any bedroom is a walk-through, and whether the ground-floor room is a proper bedroom or a converted space next to the kitchen.

Where to stay
Villa Karla
What the price includes
In Croatia, the advertised nightly rate is often not the total. Check specifically for the cleaning fee, the tourist tax per person per night, a deposit, and whether bed linen, towels and pool towels are included or charged.
Also ask what happens with air conditioning and heating — some rentals meter them separately, and in August that is not a trivial line.
The clearest signal of a well-run rental is a price that already contains everything. If you have to assemble the total yourself from four numbers, expect a fifth to appear.
Location, in minutes rather than kilometres
Istrian roads are winding and the distances on a map lie. Ask for driving times, not distances: to the nearest beach, to the nearest supermarket, to the nearest restaurant, to the airport. "Five kilometres from the sea" can be eight minutes or twenty depending on which five kilometres.
And ask what the last stretch of road is like. A gravel track for the final kilometre is common inland and matters if you are arriving in a low hire car after dark.
Booking direct or through a platform
Both work. Booking direct usually means talking to the person who owns the house, which is the fastest way to get honest answers to every question above — and the answers are better because they know what an unhappy guest costs them.
