Dishwasher safe. Microwave safe. Oven safe. As long as there is no shock in temperature cold to hot, or hot to cold. But as with any handcrafted piece; washing by hand is advised.
Most wares in a glossy glaze are very hard wearing and so, marking should only occur after some time. When matt glazes are used there are a few things to note. Scraping cutlery over the surface of a matte glaze can often leave light marking on the surface of your piece. Marking can be more or less noticeable depending on the colour of the glaze and the pressure of said cutlery, however you will find over time that these marks tend to blend out into a general patina on your plate or bowl. If this marking is an issue for you, I recommend sticking with a glossy finish.
Every piece is thrown on the potter's wheel and is individual in it's exact measurements; please allow a little leeway in this regard.