Ciao! Alberto, I got a friend has the same name as you:)
It’s depends on where do you work. While usually the area around Tongzilin, kehuabeilu, First Ring Road, Jiuyan qiao are idea areas for foreigners. There are a lot of bars around that area and many foreigners around.
For your preferred rent, it’s better to find yourself a flatmate, otherwise the rent will probably be higher than 150 euro if you want to find a decent flat.
These are good suggestions. I would add Yulin to the list – that is a popular foreign district and in my opinion, the best neighborhood to be in along with Tongzilin. Another area to check out is around the US Consulate, in the Zongnan and Zongbei neighborhoods.