I've been at one of Realkasa's apartment twice now in the space of a couple of weeks. The check in is always very smooth and they are very friendly and ready to help (they let me check in earlier which was really helpful as I was moving around with a lot of luggages).
The apartments are very modern and clean and perfect for one person or a couple that is looking to stay in the city for a few days. They are also super close to the city centre and allow you to walk everywhere.
There is no washing machine or oven in the apartments I've been in, which was fine for me but something to consider if you are saying for a longer period of time.
Will def be back again!