Petya's place is lovely and very well located in Alfama. I really recommend it. There are Fado places all around so you can enjoy the music but it's not a problem for sleeping because it stops around midnight (even before). The train station is close to the house so it's easy to move around and the blue line covers all the great places you'll need to see! Our hosts were very nice to us and even offer us a bottle of wine as a welcome! We had a great time.