I usually send around €2k every month. To avoid triggering alarm bells, I would stay in the sub-10k territory and even that is already critically high enough to raise eyebrows, especially if the local bank detects some kind of structuring pattern in the way money is flowing into your account. Structuring is obvious when incremental transfers can be assumed or perceived to originate from a larger source of funds but the transfers are deliberately trimmed or minimized to an amount which falls below statutory reporting standards (usually USD/EUR 10k). Irregularities in the timing of the transfers and a deviation from certain account activity patterns are the usual signs they look for. Keeping amounts reasonably low and being careful not to withdraw those inward funds in cash are crucial to avoid a transaction audit and inquiries being made “behind the scenes” (for example, the local bank might send a SWIFT MT107 AML Interrogative for clarification purposes).

And yes, adding your own reference description on the Mistertango app is perfectly ok. Here’s a trial transfer page to show you:

http://imgur.com/aFWwRak

As long as you have legitimate motives, you will enjoy Mistertango’s services.