I'm currently studying in Madrid (until June) and my parents have decided to come for a surprise visit...I've done a bit of chowing since January, but my student budget hasn't allowed for splurges yet. I'd really like to take my parents out to some nice sit-down restaurants - not the most expensive and not too formal, but with nice ambience for chatting, ideally Spanish food that isn't too adventurous (they're not picky, but aren't fans of experimental/haute cuisine). They don't drink, so wine list isn't an issue.
Their hotel is on Gran Via, but we'd be willing to take the metro anywhere.
Thanks very much in advance!