Hello Iko RM-RV,

Thanks for reaching out. While I agree secondary is too high of a classification for this area, residential seems more appropriate than unclassified based on the tagging guidelines you shared. For example, the primary use of the following roads are to connect residential streets and provide access to housing: https://www.openstreetmap.org/way/511483505, https://www.openstreetmap.org/way/1172898912.

Additionally, it would be best to maintain consistency in the classification of the following ways rather than having differing segmented classifications: https://www.openstreetmap.org/way/676158853, https://www.openstreetmap.org/way/1170451288,  https://www.openstreetmap.org/way/511484733.

Thank you and I look forward to hearing back from you. 