Lovely little apartment - very clean and nicely decorated. The apartment had a great shower and the bed was comfy (my sister staying on the sofa bed didn't find hers as comfy but I don't think sofa beds ever are).
Location is good. It's only a stones throw from the train station, bus station and a metro station (although that is currently closed) and a taxi rank is across the road. We walked to a lot of the attractions we saw but that did take a bit longer (30-45 mins generally) so if you don't mind a bit of walking it's good too. Also close by to plenty of restaurants and shops.
I would say it is a bit small for four people, I think this would be ideal for two, maybe three at a push. I think four adults in that space would be very cramped.
Overall we had a really lovely stay and I would recommend this apartment.