Sofia's apartment in Lisbon was a great place to stay for me and my wife. It's small and cozy. The bed is very comfortable and the bedroom has a heater, which we didn't end up using in late March. The couch appears to be a pullout so potentially more people could stay, but it would be a tight fit for more than two.
Sofia and her husband are excellent hosts. We arrived a little earlier than planned, and they were still able to check us in without us having to wait. As a pleasant surprise, they brought us delicious pasteis de nata from a famous local bakery.
The apartment is located walking distance to many great bars and restaurants. It is up on a hill, so expect an uphill climb every time you walk back. Be aware that the location can be noisy late at night due to all the activity in the area.