at the top

First off, nothing is bolded.

And you can check Google Maps and just put the address in and actually see the building when you switch to Street View. A terraced house is called a row house in a lot of other places. It's attached to other buildings. Cities like San Francisco and Boston have a lot of row houses. It's something of an older style.

The "very top of the house" is exactly what it sounds like. Whatever is the top floor, that's it. Since someone is living there, it implies at least 1 finished room. But otherwise, there are no contextual clues. It's also not necessarily just 2 floors. It could be more although more than 5 or so and you're probably not talking about a house anymore and more like an apartment building, even a small one.

Stare out of a window implies nothing of the sort. It just means someone is looking, whether the window is open or closed, and whether their head is within the room or not.

I'm assuming you're asking if "like looking at a Monopoly board" is an idiom. It is not. It is exactly what they are saying, most likely implying that the buildings and streets are laid out in a neat, well-planned grid.

You seem to be overthinking this. Everything here is rather straightforward. Adding complexity where there is none intended is only going to make learning English more difficult.

One difference between the US and UK is that in the UK the lowest level is the ground floor but in the US the lowest level is the first floor.

In the UK the main Monopoly game is based on London, Piccadilly Circus and Trafalgar Square are both properties on the Monopoly board.

All majority of European countries, with the notable exception of Russia, have a specific name for the ground level of a building. And the level above is the first floor. The reason is simple: this practice dates back to the Middle Ages. But it wasn’t adopted by Americans when they began building cities.

We use the European terms in Canada, as well... so do you know how this terminology came about, Walter?

Thanks Walter, that's something new I learned today.

It was first used in France to what I know (and could find out) - rez de chaussée - around 1560.
Shortly later, rez de chaussée or parterre came in use in Germany, translated to Erdgeschozs (in today's German Erdgeschoß), while Paterre was still used in the 20th century (i.e. my grandmother and grandaunt still used this term).

We use this terminology in Australia as well.

I mean here in written sources. It certainly must been used this way in speech earlier.

French was mainly spoken at the courts of Europe.
Germanised French terms often date back to the time of the Thirty Years' War and especially the French occupation by Napoleon.

In case anyone was wondering.



https://en.wikipedia.org/wiki/AC/DC

Thanks, Walter!