Lisbon is filled with many great areas for nightlife, so choose your accommodations carefully. If you're someone like me who loves to sleep, you won't want to stay in those areas filled with nightlife or bars since you'll be up all night. Opt to stay in Baixa, Chiado, or Marques de Pombal for quiet.
I chose to stay at the Four Seasons Hotel Ritz Lisbon since it is a quiet area and is within walking distance to both Bairro Alto and Chiado. The hotel's rooms were all recently redone (and look gorgeous) and we had an incredible balcony that overlooked the entire city.