Amazing experience!
Firstly, the location of the apartment is awesome - we stayed both in Baixa Chiado and in the centre of Bairro Alto, and it was much more fun, life and bars on Baixa Chiado where this apartment is located.
The apartment is fabulous - it's spacious (it's literally a castle!!), very beautifully done, fully equipped, and very cozy. The host is incredible - he met us personally with chilled wine and local cheeses, gave us some tips, even offered portable hotspot for free! He's been very helpful, hopped on a call with a taxi driver to explain the directions, helped us with the luggage, was available 24/7 for any questions and was checking how we are doing every now and then as if we were old friends who he was waiting to have as guest.
He was also very flexible with check-in time, which is appreciated.
Great stay, would definitely return here!