Benjamin's place was perfect for a solo trip. I had decided to forgo an actual bed for a sofabed to be at that location. However, the sofabed was comfortable as it had a mattress pad on top. I also typically like a firmer mattress so this was perfect.
The metro was less than 5 min walking and easy to maneuver. I felt safe in the area. There are some instructions on ensuring your safety overnight (like not leaving your window open at night) but I did not feel uncomfortable.
Everything was as described and Benjamin gave excellent recommendations. My only confusion was thinking the balcony was big enough to sit on, but it's only wide enough to stand so that you can hang your clothes to dry.
I definitely recommend staying if you're a solo traveler or a couple that doesn't mind smaller spaces!