Is marblehost the most stable unlimited hosting provider in Europe?

That company has a high rep.

You will hardly find a better unlimited provider than marblehost.com.
They are good at providing unlimited hosting with high uptime and their pricing is modest and affordable.

Marblehost company is worth your trust and you may try them with no hesitations.
You will hardly find any better unlimited host.
And their prices are reasonable.

To my mind, it will be reasonable to choose a host who understands your specific needs, and who can sit down with you and talk about what your needs are, and how that host can accommodate for those needs.
Check out cheap hosting deals offered by aspnix.com - windows specialized web host.
Easy set-up in control panel as well, and an excellent price.