Well done Rudolfo, You could waist your entire holidays trying to assemble one of the Ikea products.
Remember to buy your tickets for the Alaris train to Valencia in advance, friday evenings are really busy. The train is fantastic to go to Valencia, it takes only 3 hours 20 minutes from Madrid Atocha to the very centre of Valencia city, its comfortable and it has even a bar car with snacks, coffee and drinks.
You could take the metro in Valencia to go to the airport, its easy and cheap.
Have fun in my two home cities.
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Damián