It's not a holiday if you have to be employed as service staff! Staying here, you are essentially paying them to keep their place clean like defrosting the fridge before you leave, bringing your own tea towels and buy your own cleaning supplies, cleaning the bathroom, making the bed for the next person, etc. I have stayed in most hostels where the beds are made and they clean everything for you.
The so-called "6 person flat" is only good for 2 people (maybe with 2 kids). We dread to think how small the 2-person flat is! The 6-person flat layout is cramped and badly laid out (e.g. we couldn't open the window in our bedroom because the bed was too big). Check-in and check-out take hours (you need an appointment!). The wifi works half the time. You can smell when the neighbours smoke, there is no privacy.
We will never stay at any Odalys in the world ever again, nor recommend it.
Good sides: it's very cheap, very quiet at night, the staff are super nice and helpful, the swimming pool is super, it's walking distance into town.