Property prices in Prague experienced about 10% increase in prices for last year so I hope to "catch the wave" and sell it while the price is still rising.

The rooms that are too cold get more airflow, the rooms too hot get less (in heating condition, reverse for AC).

The MLS is the best way for an appraiser to assess the interior condition of a property....driving by comp.s is not a requirement."

Just increase your iso or change the aperture.  

I've been thinking for a while in working for myself and increasing wealth instead of just money.

Garden level rental rates are going to vary block by block and depending on condition/amenities.If there is a specific property you are asking about then maybe you would get more traction.

Let me know what type of properties as far as condition, clear titles etc you are willing to consider.  

It obviously varies by property condition.

I imagine that the length increases by some amount, but I doubt it would be a full year since many tenants feel fine riding out a month-to-month lease until they decide to leave.Do the downsides (forfeit of owner ability to increase rents after the year and potential to get stuck with a trouble tenant constantly calling for minor repairs) compensate for whatever this additional length of stay is?

Besides debt service will your expenses increase against the new gross income?