Will it fit a standard 18-inch cabinet opening?

Yes. It is an 18-inch-wide built-in unit, so it fits a narrow cabinet gap where a 24-inch dishwasher will not. Measure the opening height and depth before ordering, since built-in models need clearance at the back for hoses.

Does it have a third rack for cutlery?

No. Cutlery goes in a basket that sits in the lower rack. That is simpler to load but takes up space that a third rack would free for plates and bowls.

Can I control it from my phone?

No. There is no Wi-Fi or app control. You set cycles from the front panel and read status on the display.

Is it big enough for a family?

It suits one or two people. An 18-inch tub holds fewer place settings than a 24-inch model, so a family of four will likely need to run it more than once a day.

What comes in the box?

The dishwasher, a cutlery basket, the inlet and drain hoses, and the installation instructions. A power cord and fittings vary by market, so check the listing before you buy.