When I was looking for a place to host a Minecraft server for me and my friends, I have found Zap-Hosting and made a server with them, because they offered a flexible server setup with me being able to choose how much GB Ram and how many Player slots I need. As such i was able to get a rather high amount of RAM with a low number of Player slots for a lower price than on other pages. Seeing that they had a 24/7 support chat, and seeing their professional and nice looking web interface made me feel safe.
Additional information: I played on the server with a small friend group, roughly 7 people in total, most from Europe and North America. The server was located in Europe.

For one week, everything worked as intended, but then the problems started. The server became rather laggy, up to the point where it took multiple seconds to get a response from the server, and there were many forced disconnects due to a connection timeout. So I've made use of the 24/7 support chat and told them about the problem I had. The agent who was connected to me that day claimed to see nothing wrong and sent me a link to download a program and run it using the server IP. AS it turned out, that program was a tool that sends a ping to every port on a server and then monitors those pings that get a reply, in turn creating a list of services on the server, including their highest, lowest, and average ping. My server was among that list, with a highest ping of 10.000 (10 seconds) and some other services on the server showed similar results, two of them with an average ping of 5.000 (5 seconds). As instructed, I have made a screenshot of the tool with all the ping values displayed and sent that, but upon seeing those ping numbers the Agent told me that everything seemed fine. However, he did tell me that he can offer me to migrate to a new serverbox to see if that fixes the issue and told me to make a backup first. I've made the backup, the server was migrated to a new box, and I've installed the backup again. After that the server was running smoothly again. I thanked the agent and we went on.

One hour was all it took. After one hour, the same problems started again, so I once more contacted the support team and asked them to look into it. They worked on it for about an hour, before they said that things are working again, so I've connected to the server to find a brand new world, with our savegame gone. When I inquired about it, I was told that I obviously have started a server reinstall and that's why the save was gone, and I was told to see for myself in the activities log. Lo and behold, there I saw the entry stating that a server reinstall was initiated. But interestingly the name displayed for this operation was that of the support agent, while the multiple server start operations as well as the creation of the backup showed my name. Thinking to myself that I don't need to be an $#*! and don't need to shove it into their face that I've been working with servers for big companies, I play dumb and just accept what the agent said, me myself saying that apparently I have misclicked or such. After roughly two hours, the server was back up, the progress since the last backup lost.

One day later, the server just suddenly crashes. As I reboot it, our world is wiped once more. Support does not see anything wrong. They assist me in rolling back the last backup I had, but otherwise say that they see nothing wrong.

Two days later it happens again. The exact same thing. Except that this time rolling back the backup didn't work. I contacted support and a ticket was created. 11 hours later I was told that the server was restored and that an issue with the server has been fixed.

One day later, I once again have issues. But this time I find that my backups are gone. So I report this, and the answer I get is that I obviously did not make the backups correctly and they are gone because of that. As such I've mentioned that I had made those backups and that I have even rolled back those backups, meaning that I did not create them incorrectly, but that they were gone. The question I got in return, was if I had maybe deleted them myself.

All in all, being on Zap-Hosting has caused me quite a lot of troubles. Would not recommend.