Alexandra is a great host and very nice person. She gave very detailed instruction of how to get to her place from airport, which was very helpful. She also gave a few tips about the places around and provided with a map of Paris. Last but not least - Alexandra's English is really great ^_^)
The appartment is located near the 2 metro stations in the Belleville area, so you won't get lost. The neighborhood itself is very lively (and a little noisy at night, but it's ok), there are lot of nice and rather unexpensive cafes around, big supermarket, tabac shop. The Père Lachaise cemetary is like 10 minutes walk from the flat, also there's a nice park around.
As for the appartment, we had everything we needed - a bit small, but clean room with a really comfortable bed, nice table for breakfast, shower towels, wi-fi and a wonderful view from the window to the Église Notre-Dame-de-la-Croix (it's gorgeous especially at night) :) So, I would definitely recommend this place for couples who want to spend a week in Paris. You'll have a great time.