The experiences and knowledge gained from user tests with primary (elderly) and secondary (caretakers) users carried out at two of the five different User Research Bases (URBs) in the FRR Project, located in Lund and Athens, have been analyzed for commonalities and differences. Aim of the tests was to actively involve users in all the phases of development of the FRR, including needs assessment, actual measurements, reporting of requirements, and evaluation of designed components. Working with people with different abilities proved to be a challenging research experience in both URBs. In-depth understanding about what test persons need, think and feel about their difficulties in daily life was only possible through recognition of the importance of the role of test persons in this interaction. Valuable experience was gained about how to manage difficulties during interaction with test persons and prototypes as well as working in a multidisciplinary team and in collaboration with other URBs from different scientific and cultural backgrounds. It is concluded that rest rooms of today are often unnecessarily inaccessible and the test results of the FRR project have increased the knowledge on how to improve the design of toilets; and this, comparing the results from the different URBs, does not really seem to differ from culture to culture.