... Cohen was well aware of the standard debriefing process in which cooperators in this District regularly participate, and declined to participate. While he answered questions about the charged conduct, he refused to discuss other uncharged criminal conduct, if any, in which he may have participated. This precludes him from being given credit for “substantial assistance” and obtaining a 5K1.1 letter. The Court should not sentence Cohen as if he has one. That is, the credit given to Cohen should not approximate the credit that a witness with a cooperation agreement and a 5K1.1 letter would merit.

Cohen's major problem at Otisville is likely to be be boredom -- there's not much to do at the camp. I think the best thing his supporters can do for him is buy him a subscription to a magazine or newspaper they think he'll like, or have books sent to him directly from Amazon. Make sure the publisher includes his BOP register number after his name on the mailing label: Michael Cohen, Reg. #86067-054.

Cohen pleaded guilty to willful tax evasion, making false statements to a financial institution, illegal campaign contributions, and making false statements to Congress. From the Govt's sentencing memo on his and Trump's attempt to influence the election by quashing the stories of two women who claimed to have had affairs with Trump, citing paragraphs of the Presentence Report (PSR):

During the campaign, Cohen played a central role in two similar schemes to purchase the rights to stories – each from women who claimed to have had an affair with Individual-1 – so as to suppress the stories and thereby prevent them from influencing the election. With respect to both payments, Cohen acted with the intent to influence the 2016 presidential election. Cohen coordinated his actions with one or more members of the campaign, including through meetings and phone calls, about the fact, nature, and timing of the payments. (PSR ¶ 51). In particular, and as Cohen himself has now admitted, with respect to both payments, he acted in coordination with and at the direction of Individual-1. (PSR ¶¶ 41, 45). As a result of Cohen’s actions, neither woman spoke to the press prior to the election. (PSR ¶ 51).

Cohen doesn't just owe the Government prison time. He has a $50k fine and must pay $1.34 million in restitution once he gets released. He also has agreed to forfeit $500k.

Here's the inmate handbook for the Otisville Camp. Clearly, BOP is expecting him, they already have him listed with the note ("Not in BOP Custody").