We spent 5 nights at Ricardo's place. This apartment is on a second floor of a centenary building. Ricardo was always responsive and helped us whenever was needed.
The area is quiet and you have a 20 minute walk to Alfama or Chiado, there is a metro station nearby but it will not make a big difference in terms of saving time.
The pictures reflect what the apartment is but I would say the shower/bathtub area needs an upgrade. We did not have internet for a couple days due to some technical problems but Ricardo tried his best.
There are some good restaurants just 1 minute away, Chao da Pedra and Quatro au Rato, the last one is great for lunch, only 10 euros, or breakfast and the service was awesome.
I personally wanted to thank Ricardo because he let us book the place for 2 people when we were a couple and a 10 year old, also he let us use the apartment the last day until 3 pm since we had a mid afternoon flight.