The download of the app doesn't contain viruses or any kind of malware. Ch. APPerone is the developer of Partyservice Lienus Koster which can be found in the Lifestyle category. Over 10 users downloaded and installed the tool and its most recent update was on Oct 15, 2015.
Ads are a part of this application. You can get the setup package of Partyservice Lienus Koster 0.0.1 for free and have a look at users' reviews on Droid Informer. The app works fine on Android 4.1 and above.