I stayed at Tiago's apartment for four nights, Thursday to Monday. The apartment is clean, bright and ample in size for a solo traveler like me. The photos posted on the Internet is pretty accurate of what you should expect. The kitchen is well equipped with the toaster, coffee maker, pots, pans, utensils, etc. (The kitchen roof is angled, watch your head, I hit mine twice, my bad.) The apartment is on the very top floor, so it's quite a challenging climb esp. when you have heavy luggage. The location is walking distance to everywhere, I even walked to the Afirma neighborhood, took me about 25-30 mins. On Friday and Saturday night, the streets down below gets super packed with party revelers. There are multiple bars right below the apartment so it gets pretty loud from midnight until the wee hours of 3 or 4. Bring earplugs if you can't stand noise.
Tiago is the sweetest host though. He gave me good recommendations of restaurants and places to go. We didn't meet in person, but someday I hope to be back. Lisbon is a charming city.