The apartment is very much suitable for a couple traveling with low budget - central location, spacious, with an elevator and heat. The one thing we were surprised by, is the weird structure of the apartment. You have a private space and all, but the bathroom is in the hallway of that private space, but outside the actual apartment. And so, when you leave the bathroom/shower, you pass for a second through a hallway that is separated by a glass door from the rest of the space outside.
Although it took us a while to get used to this, and we would have loved to be aware of that beforehand, we managed and it wasn't a great trouble.