Absolutely loved our stay! Gaia was very accommodating, met us on time, and had a beautiful and very clean apartment. Because I was traveling with my mum, I took use of the sofa bed as well (she had the bedroom of course haha) and it was comfy.
The 4 flights of stairs wasn't an issue at all for us as it helped us compensate for what we ate. Just as long as your aware of the stairs, you'll have an amazing time.
Extremely central apartment. Walking distance to everything! And lots of beautiful little restaurants to go for dinner. We would definitely come back again.