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Hi susan,
Thank you so much for your detailed explanation.
[quote=susan53;78352]
Excuse me - I've just checked in and I'm in room 213. But my room doesn't have a bathtub. When I booked I specifically asked for one, and you said it wasn't a problem. Can you change the room please?

Can I use "there isn't a bathtub in my room" instead of "my room doesn't have a bathtub" here without changing the meaning?

It's very difficult to think of a context where you would want to say something like My room has a chair. Possibly if you were comparing hotel rooms with a friend who hasn't seen your room you might say something like: Oh this is a nice room. Much nicer than mine. You've got an armchair! My room has a chair, but it's not as nice as yours!

Can I use "There is a chair in my room" instead of "My room has a chair" here without changing the meaning?

But change the context and it might work. Imagine a hotel called "The Entomologist's Retreat" which specialises in holidays for bug hunters. The hotel is decorated with pictures of various insects. This time, when you see your friend's room, you say : Oh - you've got butterflies and scarab beetles. That's much nicer than my room. My room has ants and cockroaches.

Can I use "There are ants and cockroaches in my room" instead of "My room has ants and cockroaches" here without changing the meaning?