Mains supply here is 127V at 60Hz, using plug types C, N.
Voltage depends on the region — some states run 127V and others 220V, and both can exist in one building. Check the label on the outlet or ask the hotel before plugging in a single-voltage appliance.
A plug adapter changes the shape of the pins and nothing else. A single-voltage kettle from a 120V country will not work safely on a 230V supply no matter which adapter you use — check the label on the appliance for a dual-voltage range before you pack it. More on travel kettles and voltage →
What to expect in the room
Resort properties usually provide a coffee maker or capsule machine; smaller and city hotels more often rely on the lobby or restaurant. Locally grown coffee is frequently supplied and is often very good.