My family stayed in the ground-floor apartment. It isn't as large or nice as the upstairs ones, but was great to not have to walk upstairs (we have a little kid and a stroller with us). The location is great with a lot of places to eat nearby, a nice park, supermarkets, and within 10-20 minute walk of major tourist sites.
I was worried that the apartment would be load because the windows are on street level, but it was quiet. It might be loud in summer though (we were there in winter).
The apartment had a nice vibe to it and was comfortable. It felt very safe too and there was always someone sitting at the reception across the street keeping an eye on the building.
There were a few things missing (dish drying rack, cutting board, salt/oil/vinegar, hooks for towels) but not a big deal -- especially if you don't plan on cooking. While the place wasn't the nicest that we've stayed at and had a bit of a hotel vibe instead of a home, it was definitely a good value.