Tiago's place is wonderful and I would highly recommend a stay here for your time in Lisbon. The apartment is well-located but off of the bustling main streets on a quiet side street. The area is very safe at all hours as well.
Check-in and communication were all easy and the apartment itself, while small, has everything you would need during your stay and is very cutely decorated. The rooftop view is stunning and great for having some evening drinks!
As an an aside, if you want to have a really great Friday night fado experience away from the usual Alfama spots I highly recommend Devagar Devagarinho which is literally right at the end of the street. Make a reservation ahead of time for the upstairs around 8:30, and get the red sangria! You won't be disappointed!