Almost getting a Parisian pied-a-terre

During our recent wanderings in Paris, we - quite unexpectedly - had an apartment 'jumping upon us' when we happened to look at the window of a real estate agent. The displayed apartment was tiny but manageable - and most important: It was in our favorite area of the 18th arrondissement with a rooftop terrace and the most fantastic view across the iconic grey zinc roofs of Paris up towards the Sacre Coeur. We contacted the agent and visited the apartment, we stood on the terrace and enjoyed the view, we talked to our bank at home and we thought hard for the next few days, but - eventually - we gave it up! It was too nerve-racking to buy the very first Paris property, we had ever looked at. We felt we needed to have a further look around. Now - weeks later, we fear this apartment might actually turn out to have been the best find we will ever have inside our possible price bracket. Regardless of possible regrets - 'our' apartment is way gone. In the overheated rea...