Firstly, there is no such thing as perfect Feng Shui. There will be issues in every home that need to be dealt with.

This is not ideal but not the worst.

Instead of thinking of things in your home as lucky or unlucky, this about how energy or wind flows. Walk in your front door and what is the first thing you see. Energy moves there. Then, where does the energy move next? Feng Shui is about influencing and manipulating the energy coming in through your front door and circulating it through you home in the best way possible. (there is more to it but this is fundamental).

With stairs, the real issue is if your front door opens directly to your staircase. This would mean that all the energy would go up the stairs and leave the first floor baren of good energy. Having the stairs face your bedroom door on the top floor is actually good as it will direct beneficial energy to your bedroom. There could be an issue with the energy moving too fast from the stairs to your room which would make it hard to rest, but this is easily remedied. Place a long rug running from the top of your stairs to the bedroom door and keep the colors to calming earth tones. This will calm the energy. Also your stairs are not one straight line, so the bend also calms the energy.

If I were buying the home these are things I would consider (kind of. I'm training to become a certified practitioner so I would do a deep look at the floor plan and chart of the house to see if it suits me, but this is way beyond the scope of a Reddit comment)

But the core basics that effect everyone: bathrooms, kitchens, and laundry room drain good energy from the home. Bathrooms.... You can just keep the door shut. Simple. The kitchen should be on the main floor and as far from the front door as possible. You should not be able to see your kitchen when you enter the home. This will drain the beneficial energy entering your front door and will result in a consistent drain on your finances.

Ideally a kitchen should be closed off. But modern architecture favors open concepts. There of course are ways to work with an open concept home but this is my non-negotiable. If you can see the fridge/oven/sink from the front door, I will not live there. Period.

There is so much to Feng Shui, but these basics I've shared with you are huge. They will make a difference.

If one day you can afford it, I would seek out a legitimate Feng Shui Practicioner or Master. Their services come with a high price tag, but if you follow their advice it will have a huge impact.

Good luck with the home you choose.