Nice job on your reno! It looks very clean and wouldn't be an issue for myself as a 6ft+ individual. With that being said, here are a few things to consider:
1) Assuming the standard 36in base cabinet + 24in backsplash = the bottom of the upper cabinet starts at 5ft (60in). The wingspan of an average human is 63-68 inches, meaning the average renter would only be allowed to reach 3-8 inches, or the bottom shelf in the cabinet.
2) Because your intent is to make this a short-term rental, the same renter isn't going to be using the kitchen day in and day out. Although, it could cause some negative feedback from some of your renters.
3) If you ever wanted to rent this property out as a long-term rental or sell, it could cause issues in the future.
Tough call because its already completed. If the contractor is off the hook, you can try renting it and see what the feedback is. Ideally, you should get the contractor to come back, cut 2 rows of tile, and install the cabinets between 15-18in off the countertop.