We had a great stay at Joao and Raquel's house. We didn't cross paths because the key is to be taken from a secure box, but Raquel was very available to help us when we needed it.
The apartment is very well located in the beautiful Alfama district. Very well decorated, well insulated from noise and heat.
Little suggestions: some cleaning supplies during the stay and an extra blanket, as the apartment is a bit cold at night.
Still I would definitely recommand, good location and good price for the city.