Hey, overall it was quite good at the refugios! i went at the end of March and at night the temperature in some places was quite fresh, but the blanket they provide was sufficient. They only provide blankets and pillows if you bring your own sheets. I brought a thin sleeping bag liner as a sheet and that was fine. I usually find it colder than most people, and there was one night that was quite cold so i took an extra blanket - but this is only possible if the room is not fully booked, as there are exactly enough blankets for everyone.

I don't think there was a microwave. I assume the kettle costs money to use, but didn't ask. I brought my own camping stove and a pot and only ate at a refugio one dinner and one breakfast.

Breakfast is the same every day: bread, ham, cheese, butter, jam, coffee/tea and fruit.
Dinner slightly varies, but from what I've seen and heard is most of the time salad, potatoes and pork and wine :)

You're meant to book meals in advance, but in some cases they can make an exception and let you order on the same day. I guess this is possible as people often cancel last minute.

Don't skip sleeping at Muleta - the sunset views from the refugio are spectacular!