First of all: This is an amazing apartment in a prime location in Lisbon! The place is just beautiful, especially the terrace is great for epic sunsets. A brand new bathroom with a rain shower made us feel like staying in a luxury hotel and Pedro was a perfect host, treating us with wine and some local sweets.
You should be aware that the apartment is on the 5th floor of a very old building - so it's quite a challenge to get your luggage up and down the steep stairs. Also it's quite noisy all day and night as this is the neighborhood where people love to hang out for drinks, talk and music.
But overall I definitely recommend staying at Pedro's place - you're right in the middle of everything and can easily walk everywhere!