Regina was a lovely host! She was very kind and welcoming to her home. It was a short walk to the u-bahn, which made it super easy to get anywhere. Her husband is also a tour guide and can give you any additional advice/tips! Regina recommended a specific christmas market too and it was beautiful; more authentic and less commercial than the others. The room was quite large and cozy, with your own private bathroom (just share a bath in the other). Would highly recommend their spot if you go to Berlin!