I used in my example situation Hector Object Mapping, HOM also for creation of the database from scratch. This was not a good idea, because everything was handled as bytes, like they normally are, and no instructions about how to interpret them was thus given.
Solution to this was to use cqlsh client and give there CQL queries to add tables. So, I made queries like:
CREATE COLUMNFAMILY users (KEY varchar PRIMARY KEY, password varchar);
and with these the remarkable thing is the explicit type (varchar for password) that was given to each column. Now, on the very same tool, data was interpreted as I wanted.
More info in Getting started with CQL page.
Also see CQL Language Reference for more information e.g. about available datatypes other than varchar mentioned before.