Many of the Spanish hotels have 110v in the dressing area for shavers and low power devices. I'm not sure I've used one yet that would power any kettle.
We use the room's coffee machine for hot water. We take a couple of fast-food vinegar packs and use those with water flushes to descale and freshen the coffee maker first.
Works just great.
For computers, phones and such, we plug a power bar into the 220v line and plug all our stuff into it, once, and leave it plugged in..
For those familiar with Cuban power, the flashes and pops should only be tolerated once per trip.
It's odd that a modern laptop power supply would have any problem, but that's what replacement warranties are for.
Read the fine print on your ac adaptors, chargers and dongles to be sure they are multi (100v-220v) voltage.