We spent a week in Andreia's/Jorge's apartment. We never met our hosts. The location in Alfama is very well and the area is beautyful. There is a supermarket and a pastry cafe nearby. The price/value was fair.
However we also faced a few downsides:
1. Their are no windows in the apartment. You don't know if it's day or night when you wake up.
2. We had over a dozen electrical shortcuts. For instance it's impossible to use aircondition and stove at the same time. This was quite annoying and required some planning which electrical devices to use at a certain time.
3. The hot water in the shower was limited to around 3 minutes and became cold afterwards. Andreia/Jorge wrote us that this is due to the small boiler and "nobody complained so far". It was impossible to take a hot shower not even talking about both of us consequently using hot water. This issue was not fixed during our stay.