(1) Firstly, although they describe they have free parking, it is almost false. There is only two street parking in front of the apartment, but these are permanently occupied by local people.
(2) There you can expect NO SUPPORT during night and holidays. In our case, it was really miserable so that we had to evacuate to another hotel instead. The Dumum support never responded during our stay, and they gave us only a very rude retrospective nonsensical excuse afterward. Maybe they give some excuse to this comment, but I can clearly mention it will be just a meaningless excuse that will never help you during your stay.
We experienced electricity trouble on the first night. The electricity has become totally down and never recovered although we found a circuit breaker and tried to fix it. It seems it is not just a breaker down. Since the apartment was an all-electric one, there was no light and NO HEATING. What was worse they never respond to our message and just abandoned us. Then, we had to evacuate to another hotel. They just almost ignored our claim and did not refund.
(3) Though it is an all-electric apartment, they allow you to use only 30A. You will experience breaker down. I think frequent breaker down must be the cause of the trouble (2). This means the episode I have described above may happen to you as well.
Overall, I strongly recommend you to avoid this apartment only has very vulnerable supporting and equipment and tend to be "cheating" people.