I'm looking for a 2 room flat in Berlin for 3 months

Hi all,
We are 3 people (a married couple and a colleague) looking for a flat in Berlin from 28th February to 28th May 2016 (3 months). We are looking for a 2 rooms (one double + one single) flat / house near the city centre (if posible, but we are flexible). Our maximum budget is 900 euros/month. Me and my colleague will be doing an Erasmus in a Kindergarten during that period and my husband will be working from home. We all are non-smokers. We are very responsible and respectful so we'll take care of the flat for sure! 
If you have any property that could fit into our needs I encourage you to contact me. I'm sure you'll be pleased to have us as a tenants!
Cheers!
Lu

PS: I put my husband's phone for contact. Please note that we don't speak German, either Spanish or English is fine! :)