As someone else posted, Catholic Charities Boston has many resources available for Ukrainian refugees.

Though they do not provide long-term housing directly, their site says they work "with a number of volunteer community sites (including churches, synagogues, mosques, cities) that assist with the sponsorship of refugees." So they should be able to connect you with possibilities.

Also from Catholic Charities..."We are happy to assess the eligibility for support for individuals who have already arrived in the United States and are in need of cash assistance or benefits." More info on how to contact them under " Cash Assistance and Benefits Eligibility" at: https://www.ccab.org/refugee-immigrant-services/refugee-resettlement/ukraine/

Another organization that may be able to help is Welcome(dot)us, a non-partisan effort to connect sponsors and refugees and provide assistance and resources https://welcome.us/about#