Yes, I like that Porto i/o is amazingly located right in the city center. I'm not much for cooking and bringing my food to eat in the lounge (I have nothing against it, many do it!), since the selection of meals and activities around is plenty. I can eat traditional local dishes, gourmet or regional meals, sushi, fast food, and yes, even regular food, all in the same week. I have a favorite burger now, ask me which is it!
Yes, I like how it's no trouble getting here, however I choose; whether it's by bus, the subway, car, ride a bike, or parachuting, the door is always open to me. (I once asked for an helipad, they didn't say no, so fingers crossed!)
Yes, I like how you can make your desk your own little corner of productivity. It feels like any work space I'd expect if I built it myself, where everyone is always respectful and mindful of one another, and the professionalism in the air helps you focus. If you're not productive here, you may want to consider switching careers... and then come back.
Yes, I like being able to attend different talks and meetups almost every week. Even if I don't have an interest in a particular event, someone always does, and I'm sure an event "for me" is just around the corner.
But, really, those are just details... All of that would only make me consider it.
What wins it for me: the Expression of the Day.
It's a friendly environment, no matter your background or your line of work. I felt immediately welcomed when I first started. Because we're friendly, we talk. Because we talk, we say things. Because we say things, some of those things are funny, especially when taken out of context. To have your words "recognized" as worthy by a group of awesome people always ready to single you out for what you say, it's an honor really.
Conversation and laughter only helps me focus better on my work. By just having an Expression of the Day, something that allies all of those aspects, I can think of no better place.