Lisboa is exactly what they've told you: colourful, vibrant, mesmerizing and HOT! The city is full of energy, day and night, and that's exactly what I was looking for. Plus a good company always makes a trip better, and British-Irish squad and I had a blast.
I'd say you probably need at least 2-3 days to get to know Lisbon properly. More than that, and you are in for a treat of discovering local gems.
Portuguese are very Mediterranean in their food culture, therefore if you are visiting the city, you are in for a treat. I particularly enjoyed having lunch at Pharmacia, a pharmacy-inspired restaurant by the museum of Pharmacy. You can enjoy some seriously delicious petiscos (tapas) and a good wine for a very decent price (€25-€35 average).
As for sweets: PASTEIS DE BELEM. I mean, what else do you need? I must tell you that it is also my favourite dessert of all times. Can you imagine how hard it was to keep myself at bay? They are so goddamn good! My favorite were the originals from Belem, but you can literally find them at every corner. Manteigaria is really good if you are in downtown Lisboa.
To top up your visit to the city, I highly recommend visiting LX Factory, which you could also visit on your way to Belem (a must).
A bit hidden in the middle of nowhere, this village is full of up and coming artists. Whether you are looking for a great bar or you'd like to get some home furniture or souvenirs, this is your kinda place.