A few people here can discuss issues with condenser dryers. They do take longer generally and you can not use dryer sheets. They typically cost more and do not perform as well as a full sized dryer, which is a compromise for the size. I think all washer/dryer combos are condensers.

You don't have many options, if any. I believe the Bosch 300 series will come close but dryer depth on that is 25". Venting will make it stick out further but you can minimize that with a dryer vent box in the wall. Can you build a recess back into another room so you can push it back further?

The Miele condensing dryer is an awesome piece of machinery, especially if you plumb the drain line, rather than pull out the reservoir and dump it. I wish I had bought one. Several people here can give more specific installation advice.