I run a B2B SaaS company. We sell to businesses. Most of them have 5-500 employees (SMB/Mid-Market). Last year we built a very simple MVP and quickly started selling it.
If you want to do this too, the buyer and idea must be compatible. The idea also has to be something the buyer wants.
Buyer: As far as I know, hotels aren't big on buying new, simple services from startups. Try brick & mortar / mom & pop stores, startups, tech companies, etc.
Idea: Tablets are a big startup cost. You're asking your first customers to pay a lot more than ours did. Or you're taking a big loss. This immediately makes it harder to get going.
Demand: Do hotels / guests even want tablets in rooms? What burning problem is this solving, how did you learn that, and why is this a great, cost-effective solution?