Sofia's flat was great! A cozy small place, perfect to spend a few days visiting the city, perfectly located! The place is indeed small, but was very clean, very nicely decorated, and the shower was really nice. You really don't need much more.
The flat is surrounded by restaurants, cafes and shops, 10 minute walk away from the city center. It gets a bit noisy friday and saturday nights, but it is normal seeing as it is so central.
Sofia was very helpful, we didn't get to meet due to both our schedules, but she sent us a message with a lot of tips, and was very available and answered to all our messages instantly! A great host.
Will definitely be coming back to Sofia's place next time I'm in Lisbon.