Got here yesterday. Went for a wander and it's a nice City. Very steep hills to negotiate if you planning on walking about (which is usually the best way to explore a City). There's even a tram dedicated to just going up and down one of the steep hills towards Bairro Alto.
Plenty of little bars and restaurants all around Bairro Alto with many youngsters drinking and having a good time. It's similar to our Norther Quarter but the little cobbled streets are a lot tighter and it's very dimly lit, it might even feel a little dodgy to some but we wandered around in the dark and felt safe. Reckon blues who are after a decent bar crawl will love this area.
Whilst wandering I heard in the distance a busker doing a rendition of Wonderwall so the locals are obviously preparing themselves for our arrival. He got a few euros for his effort :).
The Portuguese I find are amongst the most friendly people in Europe, football mad too so all in all I imagine everyone will be welcomed and have a decent trip.