What's that nursery, that room in Godric's Hallow, in Bathilda Bagshot's house in DH part 1?

No, it's not his room. It's not even a room in Bathilida's house.

Harry's house was completely destroyed (did they take out his seeing his house in the movie? I don't remember)when Voldemort attack him and his parents.

When Nagini attacked Harry and knocked him through the wall, she'd sent him into the neighbors house (the houses are all interconnected). That's their (the neighbor's) nursery room he's in.

I'm not 100% sure, but I think it's in the neighbouring house.

It is Bathilda's neighbors children's room.

The Potters' house had been almost destroyed por Voldemort when he killed Harry's parents. The wizards of the village kept the house as such to remember what had happened then : the destruction of a family and the (temporary) defeat of the Dark Lord.

I was really puzzled this at the movies, too. It seemed like Bagshot lived in a house without wall-neighbours. At first I assumed that they had changed the scene for the movie and made it to be the Potter's old house, but then it wouldn't make sense for the nursery to be in such a good shape. I think there was even a light on!

So yeah, I can't come to any other explanation but that it's the nursery of the neighbouring household.

Yeah, I think it was supposed to be the neighbor's house, like duplex. Perhaps it was meant to show the contrast between Bathilda's and all of the other houses, but it really just seemed out of place and confusing...

its in the house near bathilda's house. when the snake thrashes in the room - it most likely hit harry into a hole created, through which he fell on the other side. hope this explaind ur doubt!

It's not Harry's room they showed his house before they even met Bathilda, it was just nothing but rubble. I agree with the topo, início comment it's neighbor's room.

Yeah I agree with all of the above that it is a neighbor's nursery.

Although it is kind of ironic. Lily was killed in Harry's nursery and now Nagini attacking Harry in a nursery 17 years later.

This is totally random, but i just realized I used to have that blanket lol.

If you read the books, Harry finds a letter from his mother Lilly to Sirius Black while they are in hiding. The letter stated that Lilly was living seguinte door to bahilda. So if you ask me then yes that is Harrys room from being a baby. Also in the book the house is completely destroyed but in the movie it is not. There is still a structure standing. It was the directors way if throwing a curve to the people who never read the books and just watched the filmes if you ask me..,

This is how I interpreted it:

In the books, the snakebite and being so close to yet another Horcrux makes Harry begin to hallucinate. He flashes back to the night of his parents' death from both his own infant POV and Voldemort's simultaneously. I think showing the nursery was the film's weird way of him "falling" into the memory.

Speant a lot of time pondering this, and I think I've come up with the most likely situation. So, as Hermoine said, Voldemort was expecting them to go to Godric's hollow and to Bagshot's house. He had Nagini there for them, so he prepared well. My theory is that it's Harry's room, or rather a copy. In the scenes we see later in Snape's memories, the room and berço look very similar. I think Voldemort wanted Harry to die in his room, where he should have, 16 or so years ago. Maybe he just wanted the fulfillment of having him die there, or maybe just liked the cruel irony of it. Either way, it's the most likely thing I've been able to come up with over a few years.