I've taken appliances back and forth, and used really heavy duty transformers (the big yellow industrial type). But, here's my 2 cents....if it heats up and draws a hefty load (kettle, griddle/press,crock pot, toaster, deep fryer) don't bring it. Coffee pot - no big deal, but bear in mind that the digital clock won't work correctly (50 cycles versus 60 cycles) so you only plug it in when you use it. Check the wattage on the espresso machine; it may be fine. Likewise the rice cooker; I've never bothered with one of those, so not sure.
Hand mixers, blenders and so forth are usually fine, just not with those 'baby' transformers. Also, if something would typically be plugged in for continuous use, not really a good idea; the transformer will heat up.