Furnished 1-room studio apartment for summer stay

I'm looking for a furnished 1-room studio apartment to rent for the months of june-july-august 2019 in the Rintheim or Oststadt area.
The room should be fully furnished, preferably with access to a washing machine. It would be an advantage to have a kitchen equipped with cutlery and utensils.
I'm 21, female, and of Lebanese origin, but I study renewable energy engineering (4th year) in France (at Ecole Polytechnique).
I will be doing a 12-week internship at EIFER in the Technologiepark Karlsruhe during that period (10/06/2019 to 31/08/2019), on biomass energy.
In my free time I enjoy playing volleyball, nature macro photography and hiking. I'm very interested in environmental issues and sustainable development. I enjoy cooking various types of food: Lebanese specialties, italian food, desserts...
I would consider myself to be a calm, helpful person, always smiling! I like to go out every now and then, and would like to explore Karlsruhe during my stay. I’ll be working 39.5 hours a week, so I won’t be in the room all the time. I don’t smoke either.
Oh, I also started learning German in September. I'm still a beginner (A2 level), but I'm progressing, and would love to improve my German during my stay. My internship will be in English or French though.
If you'd like to know more about me feel free to ask. I'll also leave the link to my Facebook profile. Some content is private so send me a friend request to see more.
https://www.facebook.com/rind.elhajj