My best friend's family and my family (14 people total including 2 toddlers) stayed in Makarska for a week, and we absolutely loved having this house as our home base.
It had the perfect layout for a large group - half the rooms were upstairs, and half were downstairs so we could easily distribute people who wanted more quiet time vs social time. All but one room had private bathrooms which was incredible! The house was stocked with everything we could've needed, and even more. The kids loved all of the toys, the ping pong table, play kitchen, trampoline, etc.
If you stay here, I definitely recommend renting a car. While the beach and Old Town are technically walkable, they are about a 20 minute walk away (and on the way back it'd be uphill). With a car, it's a quick 5 min drive from anywhere you'd want to be.
Highly recommend this for a big group stay in Makarska!