The crib was used for about 3 years. It is very beautiful and sturdy American size crib ( Ikea crib sheets still fit). It is in good conditions, but expect some markings. Converts to toddler bed with safety rail. Yes, I would say good till 6 y.o, but depends on child height. I would say up to 125 cm. Yes, includes medium firmness mattress. The original price for crib only was over 950 USD. You may arrange preview, please contact me at 91685349.