You can expect self -contained accommodation, hot water all day, a fridge and cooking facilities and a lovely pool with chairs and bed at the apartments. There are also free beds on the beach which is a short walk downhill to the beach. Nearby there are some good restaurants and a mini-market but it is quite expensive here. I went into Mykonos town by bus to AB supermarket where food and beers are a lot cheaper. The bus fare is 2.30 Euros but it is better to buy a return ticket to save queueing at the bus station.
There are cooking facilities and a fridge at Maria's and ample pots, pans, crockery and cutlery if you feel inclined to cook!! Contact Maria the day before arriving if possible.