We stayed in 18C of Anna & Valdans Appartment for 5 nights. There are 2 spacious bedrooms with one of the rooms having a king size bed. There is a living and a kitchen space too. As the building is an older building the spaces are very large and open. The apartment is centrally locates and was easy to get to from the metro. Walking distance to most tourist attractions. We found the apartment to be perfect and clean. The ladies at reception were super responsive and was quick to get back to us with information etc. We were able to do laundry via their office. The only downside is that this particular apartment 18C is located on the 3rd floor (6*15 steps). There is no lift and had to lug luggage, toddler, pram and groceries up and down each morning and evening. Some afternoons the toddler was Asleep in the pram. So perhaps not for the elderly. Great workout though ;). We enjoyed our stay in Vienna.