22 years old girl with a pet, looking for an apartment in Helsinki

Hello !
I’m Mélissa, a 22 years old woman coming from France. I’m studying in 2nd year of master degree, and I will come to do an internship at the University of Helsinki (Viikki campus). My 8 years old dog will be with me for this amazing trip! (Don’t worry, she’s really well-trained)

I am looking for an apartment to rent (one room would be perfect, but studio is okay), fully furnished and accepting dogs. I’ll be there from the 1st of February to the end of April. I am mainly looking for something near the bus line n°78 (which joins Viikitär, Latokartano to Kluuvi, Helsinki). Ideally, I would prefer to be closer to Viikki than to Kluuvi of course!

I've listed some places that could be good: Viikki, Pihlajisto, Viikinmäki, Viikinranta, Koskela, Vanhakaupunki, Toukola, Arabiantanta, Kumpula.

I am calm and I do not smoke. I will spend most of my time working on my internship. Feel free to ask me if you need any further information :)

Finally, I hope to find something not too expensive (up to 900 € would be perfect).

PS: I do not speak Finnish, but I speak French and English without problem!

Thank you for your help :D