Yes, but the name of the place she used was a tiny village. Seems strange to chance upon that, and even weirder that the street she chose, didn't have that particular number house there. She must have known that.
Although the people in that street were asked about her and knew nothing....
The Postcode is completely made up from another part of Belgium, I think. 4 digits. Although lots if European countries postcodes have 4 digits.
She must've had a map of Europe (or at least Belgium) to chance upon this village and street name, unless she did, somewhere, have a personal connection.
If she was 'known' by the hotel receptionist due to previous visits, I wonder what address she gave then, on her first visit? How many years had she been going there? Oh, if only we knew....
Yes, you're right about the postcode, it relates to somewhere in Hungary - which is coincidental as the gun she used was built partially from Hungarian parts.
What I'm saying though is that that village, Verlaine, may be somewhere she has the most tenuous of connections to; she may have passed through as a traveller or as a child on holiday or for some other reason. She may never even have visited and might have heard of it in a totally unconnected manner; perhaps she studied the First World War and Belgium was a place of serious action during that conflict; perhaps Verlaine itself saw some nearby action during that conflict and her great grandfather told her war stories and recalled being billeted on Rue De La Station in Verlaine before a big battle?* It's all speculation but simply providing it as an address means very little, as far I can see. Just because she gave that name doesn't mean that she has any real connection to it or has any in depth knowledge of it.
As an example; in 1988, when I was 17, we had a family holiday near a small place in France which I think was called St Fortunade. If I were checking into a foreign hotel I could easily give that as a place of residence if I were pretending to be French. I'd only need to recall one street name. There's a chance it has a "Station Road" (I don't know I haven't checked Google Maps) but even if it doesn't then so what - who at a hotel bothers to check someone's actual address? But Station Road at least appears to be very plausible as it's undoubtedly a very common name.
I don't think it matters what address she may have given previously - if they were allowing her in with no ID then it's not really relevant as she'd be giving a fake address each time anyway, even if it was the same one.
Her check-in details are so sketchy though, and so bereft of all the usual requirements that I do not believe that she could have got away with it unless someone at the hotel allowed her to do so. Either because they knew her as a regular or they knew whomever was picking up the bill for her room. As mentioned before, hotels are often remarkably dodgy in their business practices and let lots of things slide when it involves regular or important clients or big spenders. They are good at putting up a respectable front but are also very good indeed in "taking care" of important clients or protecting their, or the hotel's, reputation. Hotels, when you think about it, are all about secrecy - they are, after all, little more than a collection of bedrooms! If a regular client, perhaps someone who's company spends tons of money each year with that hotel, or an important politician, actor or musician lets it be known that they'd like to have someone checked-in "no questions asked" then I have little doubt that the hotel would do it. I know people in that industry and it happens literally all the time. She was either unbelievably lucky to have not been asked for the usual proof of ID or someone allowed her to check-in without it. Which is more likely? I have no doubt that the most likely answer is the true one.
* I've just had more thoughts on that and, perhaps, that street had numbers higher than 100 at some point? I think she gave the address as 148? If it did then who's to say that there isn't some tenuous connection she, or her family has with that address?