前两个问题自己找到科索沃外交部有答案：http://www.mfa-ks.net/?page=2,20

The Republic of Kosovo does not yet apply a visa regime for foreign citizens. Any foreign citizen can enter the territory of the Republic of Kosovo presenting:


- Valid travel documents,

- Proof of ability to cover expenses of existence during the period of stay

- Return ticket (for short stay)

- Reason for visit to Kosovo. (Depending on the reason for visit to Kosovo other documents may be requested)


In cases when Kosovo citizens invite foreign citizens for private visits to Kosovo, then the Kosovar citizen must present, 10 days prior to the arrival of the guest, a guarantee letter to the Department for Citizenship, Asylum and Migration at the MIA, which is stamped by the competent District Court.


In cases of business visits, the guaranteeing person must present MIA documentation relating to the business that the foreign citizen will develop in Kosovo, and when necessary a copy of the business certificate of the domestic company sending the invitation.


Foreign citizens have the right to stay in Kosovo only for 90 days. After 90 days they must report to the Directorate for Foreigners at the Kosovo Police, otherwise their stay will be treated as illegal.


The border police are responsible for returning citizens in cases of reasonable suspicion regarding their documentation or reason for entering Kosovo.