My boyfriend and I have stayed in the Onia apartments for a week. The standard was okay, what you see on the pictures is what you get (besides the shower, it had a curtain that only covered half of it and thus the whole toilet and floor was wet after you shower, but that was mostly just funny). The matterace could be more comfortable but it was alright, we had to everything we needed. The apartment is not in the place that the airbnb map shows, you need to go to an adress you might recieve via message. I say might, because it caused me a lot of stress, communicating with the - well, not owner, host. She was the one who sent me a message though airbnb with some questions regarding my stay and then didn't answer for more than a month. I also tried to message through whats app - read the message and also no reply. I had to contact airbnb support to get an answer 3 days before our arrival.
Once we got there, we had a problem with finding the right place, and then the owner of the apartments didn't know we were coming (the communication between him and the person I was trying to talk to was also pretty bad I guess) and we ended up getting number 4 instead of 5 (which was not a problem at all, just shows the communication wasn't great).
During the stay no complaints, when we were leaving I also received no reply as to where to leave the keys and no help with getting a taxi.
Overall: I don't have any issues with the apartment, just the communication with the host was very stressful for me and made the stay a little less pleasant.