Buy used Surface Pro 4?

I wanted to know what you think about this offer:

Surface 4 Pro, optically in very good condition, 4GB RAM, 128GB SSD, i5-6300U processor, almost 4 years old, but keyboard with 3 defective keys for 350 euro

I would only use this tablet for university Word, PowerPoint and surf the Internet and possibly use it for Netflix. Is it worth buying or not?

Do not buy anything personally if something is broken. I'm not a fan. I would rather pay 100 to 200 euro more and buy this 4 year old device myself.

If used then only in good condition. And if 3 buttons are broken I don't want to know how the person handled the device.

I personally also think the 4GB is too weak, I was glad that my 8GB had it.

the Surface devices can't be repaired if something is wrong. So that's in the end for the bin.

There are enough tablets for the money

For a little more money you get a much better notebook. Also with touch function.
If there are 3 buttons broken, it was not really handled with care.