Very central location, in the middle of everything. We were two families with children, and it was spacious enough for all of us to spread out and feel comfortable. Nice view from the 5th floor and not too noisy say night.
There are indeed a prodigious number of stairs to get to the apartment, but I can report that a 12 year old is able climb them all in 26 seconds (the adults were significantly slower), and all of our leg muscles got stronger from the effort.