I know Porchester Road! My brother's hotel was on it, and I've walked down it several times, lovely area.

And the hotel room really was that small - the foyer was the funniest part, just enough room for one person to stand and then the two doors leading to other tiny rooms.

And Harry Potter? Eh. I mean the movie was quite good, of course, but the size didn't matter (omg, can't believe I just said that!). And the scene at the end, on the broom, actually made me laugh out loud - looked really absurd that large. But the scene where the Dementors freeze the flowers looked really lovely.