Went to Lisbon for short 3 days weekend and we couldn't find a better location. Although being located in lively Chiado-Baixa, Ricardo's apartment it's on a quiet street and double windows make 100% its job if you want full silence.
Chaido metro station is just about a throw stone away and you can reach Bairro Alto restaurants in a short walk.
Check in without problem, we arrived on early in the morning but we could leave our luggage and get general explanations from Alexandra before leaving the flat for cleaning.
Nice gesture: A bottle of vinho verde will be waiting for you at you arrival.