Someone at Anna's used a great service - they had all their dirty washing picked up from the Studios, returned the next day all washed and ironed.
2 1/2 large carrier bags full of washing and it came to 18 euros. Their name escapes me but they are in San Stefanos.
We plan using it next year. Means you could take half as much stuff, get them to wash it all after one week, then do it again. 1 suitcase instead of two, and no washing to do on return (not that I do it !!)