The description of the apartment is precise. Very clean and stylishly furnished. Yes The stairs are really a challenge if you're not fit, or not comfortable with heights ... not so good for small kids I would think... but if you're not planning to come in and out all all day it won't be a problem.
Really close to the Barrios Alto nightlife in the evening ... central without being in the noisy middle...
Very friendly host, eager to answer questions ...