In order to get this sort of 'good' renders, you need to ensure 3 things (which are equally important):
1- Your geometry must be refined and detailed enough for your needs. I see in your renders some 'choppy' objects such as mirror or washing machines has no buttons or wafer thin heater core or invisible liquid soap? Consider placing objects that makes the place alive.
2- Material must be elaborated. New Vray has quite a lot of premade materials that you can use or check other resources, investigate their material settings and tweak/test according to your needs. Slight bump or displacement on floor & walls might be useful.
3- Lighting and render settings might look harder than rest but actually easier. Consider creating lighting fixtures with regards to your scene. Investigate the 'good example' you shared for this. Read this manual for render settings and understand their functions.
I hope these help for a start.