We stayed in this apartment for 3 weeks, and had an amazing time. It's a little uphill (elevators help), but the location is stunning. You're hidden away on a little square with very friendly neighbors. It's super quiet and away from the crowds of tuk-tuks and the nearby Mercado da Ladra flea market. (Don't miss the São Vicente monastery next door, the patios inside and roof views are amazing! Also, if you're into mushrooms, eat at Santa Clara dos Cogumelos.)
The apartment is super clean, well-equipped and -finished, one of the nicest we've stayed in over the last few months. The kitchen is small but absolutely perfect, there is a giant TV, the bed is super comfortable and the windows give amazing morning light — you feel instantly refreshed when you wake up. There are also blackout shades on all the windows if you need to take a nap or sleep in. The shower is really great too.
Eric and Carlos are also instantly available and have great recommendations for what to eat and do nearby. Really friendly and amazing hosts :)