We were skeptical about renting a "boutique" apartment, but we were not only pleasantly surprised, but actually thrilled with the apartment. Sparkling clean and well layed-out, each of the two bedrooms had a comfortable king-sized bed. The kitchen, although small, was easily large enough to prepare meals for our four day stay; the fridge was sufficiently large, and we found appropriate utensils and cookware. The Spar supermarket was a 3 minute walk from the building's front door, and the #2 tram stopped right outside the front door. (This tram runs down the street directly into the ring, and then around most of Ringstrasse. It is therefore very easy to take public transportation anywhere in the city with a minimal amount of walking. But keep in mind that Vienna is a great walking city.) The metro station Rathaus is about a 5 minute walk away. The double windows kept out virtually all of the street noise, and sleeping was no problem. The on-demand hot water system was upt-to-date and efficient. Ilana arranged for us to use the washer/dryer in the building.
Because of our jobs, we have traveled and rented apartments all over the world, including multiple times in China, Japan, Korea, India, all of western and central Europe, Israel, Canada, and South America (e.g., 9 times to Italy 15 times to France, 12 times to Israel, etc.). Additionally, we have lived in both Paris and Jerusalem for extended periods of time (approximately 6 months each). For us, Ilana's apartment ranks #2 of all of our apartment rentals, behind only an over-the-top apartment in Granada, Spain in 2012. This is the ideal place to stay in Vienna.