Amazing location, but please know you are right in the mix of all of the nightlife in Bairro Alto. That said, the apartment has some AMAZING windows that block out pretty much all noise - my fiancée stayed for almost 3 weeks and never had trouble sleeping because of the noise.
It's a cute little, old apartment that has everything you need for your stay. It's great for 2 people, but probably a bit small for any more than that. It's an old building so doorways were pretty low - so you'll need to duck if you're 5'10 or taller. We both worked full-time while here and the WiFi was great and there was a desk and table so we could each have our own separate workspace. Communication was great before and during our stay - although we never had any issues and didn't really need anything.
Overall, really great stay and good value. If you're looking to stay walking distance to pretty much everything then you can't go wrong with this place. Obrigado!